81676904231 has 32 divisors (see below), whose sum is σ = 91498014720. Its totient is φ = 72424802304.

The previous prime is 81676904213. The next prime is 81676904249. The reversal of 81676904231 is 13240967618.

It is an interprime number because it is at equal distance from previous prime (81676904213) and next prime (81676904249).

It is a cyclic number.

It is not a de Polignac number, because 81676904231 - 2⁶ = 81676904167 is a prime.

It is a super-2 number, since 2×81676904231² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81676904251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29666951 + ... + 29669703.

It is an arithmetic number, because the mean of its divisors is an integer number (2859312960).

Almost surely, 2^81676904231 is an apocalyptic number.

81676904231 is a deficient number, since it is larger than the sum of its proper divisors (9821110489).

81676904231 is a wasteful number, since it uses less digits than its factorization.

81676904231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 81676904231 in words is "eighty-one billion, six hundred seventy-six million, nine hundred four thousand, two hundred thirty-one".