81313374 has 16 divisors (see below), whose sum is σ = 162735120. Its totient is φ = 27086400.

The previous prime is 81313367. The next prime is 81313381. The reversal of 81313374 is 47331318.

It is an interprime number because it is at equal distance from previous prime (81313367) and next prime (81313381).

It is a super-2 number, since 2×81313374² = 13223729582527752, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7842 + ... + 14970.

It is an arithmetic number, because the mean of its divisors is an integer number (10170945).

Almost surely, 2^81313374 is an apocalyptic number.

81313374 is an abundant number, since it is smaller than the sum of its proper divisors (81421746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81313374 is a wasteful number, since it uses less digits than its factorization.

81313374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9035.

The product of its digits is 6048, while the sum is 30.

The square root of 81313374 is about 9017.3928604669. The cubic root of 81313374 is about 433.2321327120.

The spelling of 81313374 in words is "eighty-one million, three hundred thirteen thousand, three hundred seventy-four".