81714631 has 4 divisors (see below), whose sum is σ = 86521392. Its totient is φ = 76907872.

The previous prime is 81714617. The next prime is 81714641. The reversal of 81714631 is 13641718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81714631 - 2⁹ = 81714119 is a prime.

It is a super-2 number, since 2×81714631² = 13354561838932322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81714593 and 81714602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81714601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2403355 + ... + 2403388.

It is an arithmetic number, because the mean of its divisors is an integer number (21630348).

Almost surely, 2^81714631 is an apocalyptic number.

81714631 is a deficient number, since it is larger than the sum of its proper divisors (4806761).

81714631 is a wasteful number, since it uses less digits than its factorization.

81714631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806760.

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

The square root of 81714631 is about 9039.6145382422. The cubic root of 81714631 is about 433.9435870668.

The spelling of 81714631 in words is "eighty-one million, seven hundred fourteen thousand, six hundred thirty-one".