Search a number
-
+
81953573 = 1379199401
BaseRepresentation
bin1001110001010…
…00001100100101
312201012200011112
410320220030211
5131440003243
612044314405
72013410462
oct470501445
9181180145
1081953573
1142295a29
1223542a05
1313c95650
14ac54669
1572dc818
hex4e28325

81953573 has 16 divisors (see below), whose sum is σ = 90048000. Its totient is φ = 74131200.

The previous prime is 81953567. The next prime is 81953587. The reversal of 81953573 is 37535918.

It is a happy number.

It is not a de Polignac number, because 81953573 - 212 = 81949477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81953573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81953513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204173 + ... + 204573.

It is an arithmetic number, because the mean of its divisors is an integer number (5628000).

Almost surely, 281953573 is an apocalyptic number.

It is an amenable number.

81953573 is a deficient number, since it is larger than the sum of its proper divisors (8094427).

81953573 is a wasteful number, since it uses less digits than its factorization.

81953573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 113400, while the sum is 41.

The square root of 81953573 is about 9052.8212729513. The cubic root of 81953573 is about 434.3661407230.

The spelling of 81953573 in words is "eighty-one million, nine hundred fifty-three thousand, five hundred seventy-three".

Divisors: 1 13 79 199 401 1027 2587 5213 15721 31679 79799 204373 411827 1037387 6304121 81953573