81957411 has 12 divisors (see below), whose sum is σ = 118528488. Its totient is φ = 54571104.

The previous prime is 81957383. The next prime is 81957413. The reversal of 81957411 is 11475918.

81957411 is a `hidden beast` number, since 81 + 9 + 574 + 1 + 1 = 666.

It is not a de Polignac number, because 81957411 - 2⁶ = 81957347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81957413) 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 11 ways as a sum of consecutive naturals, for example, 2791 + ... + 13103.

It is an arithmetic number, because the mean of its divisors is an integer number (9877374).

Almost surely, 2^81957411 is an apocalyptic number.

81957411 is a deficient number, since it is larger than the sum of its proper divisors (36571077).

81957411 is a wasteful number, since it uses less digits than its factorization.

81957411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11202 (or 11199 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 81957411 is about 9053.0332485858. The cubic root of 81957411 is about 434.3729212743.

The spelling of 81957411 in words is "eighty-one million, nine hundred fifty-seven thousand, four hundred eleven".