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68946931 = 431603417
BaseRepresentation
bin1000001110000…
…00101111110011
311210201212102001
410013000233303
5120122300211
610501434431
71465016314
oct407005763
9153655361
1068946931
1135a11939
121b10ba17
1311390401
14922a60b
1560bdac1
hex41c0bf3

68946931 has 4 divisors (see below), whose sum is σ = 70550392. Its totient is φ = 67343472.

The previous prime is 68946929. The next prime is 68946973. The reversal of 68946931 is 13964986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68946931 - 21 = 68946929 is a prime.

It is a super-2 number, since 2×689469312 = 9507358588637522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68941931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801666 + ... + 801751.

It is an arithmetic number, because the mean of its divisors is an integer number (17637598).

Almost surely, 268946931 is an apocalyptic number.

68946931 is a deficient number, since it is larger than the sum of its proper divisors (1603461).

68946931 is a wasteful number, since it uses less digits than its factorization.

68946931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603460.

The product of its digits is 279936, while the sum is 46.

The square root of 68946931 is about 8303.4288700512. The cubic root of 68946931 is about 410.0514133424.

The spelling of 68946931 in words is "sixty-eight million, nine hundred forty-six thousand, nine hundred thirty-one".

Divisors: 1 43 1603417 68946931