81131674 has 16 divisors (see below), whose sum is σ = 132021288. Its totient is φ = 37170432.

The previous prime is 81131671. The next prime is 81131693. The reversal of 81131674 is 47613118.

It can be written as a sum of positive squares in 4 ways, for example, as 73530625 + 7601049 = 8575^2 + 2757^2 .

It is not an unprimeable number, because it can be changed into a prime (81131671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7827 + ... + 14950.

Almost surely, 2^81131674 is an apocalyptic number.

81131674 is a deficient number, since it is larger than the sum of its proper divisors (50889614).

81131674 is a wasteful number, since it uses less digits than its factorization.

81131674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22929.

The product of its digits is 4032, while the sum is 31.

The square root of 81131674 is about 9007.3122517208. The cubic root of 81131674 is about 432.9091969667.

The spelling of 81131674 in words is "eighty-one million, one hundred thirty-one thousand, six hundred seventy-four".