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70561921 = 315367641
BaseRepresentation
bin1000011010010…
…11000010000001
311220202220202111
410031023002001
5121030440141
611000215321
71514523613
oct415130201
9156686674
1070561921
1136915241
121b76a541
1311807521
14952adb3
1562dc381
hex434b081

70561921 has 16 divisors (see below), whose sum is σ = 75437568. Its totient is φ = 65894400.

The previous prime is 70561903. The next prime is 70561927. The reversal of 70561921 is 12916507.

It is a 2-Lehmer number, since φ(70561921) divides (70561921-1)2.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 70561921 - 25 = 70561889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a deceptive number, since it divides R70561920.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70561927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109761 + ... + 110401.

It is an arithmetic number, because the mean of its divisors is an integer number (4714848).

It is a Poulet number, since it divides 270561920-1.

Almost surely, 270561921 is an apocalyptic number.

It is an amenable number.

70561921 is a deficient number, since it is larger than the sum of its proper divisors (4875647).

70561921 is a wasteful number, since it uses less digits than its factorization.

70561921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 70561921 is about 8400.1143444598. The cubic root of 70561921 is about 413.2283716458.

It can be divided in two parts, 705 and 61921, that added together give a palindrome (62626).

The spelling of 70561921 in words is "seventy million, five hundred sixty-one thousand, nine hundred twenty-one".

Divisors: 1 31 53 67 641 1643 2077 3551 19871 33973 42947 110081 1053163 1331357 2276191 70561921