81314387 has 16 divisors (see below), whose sum is σ = 101587200. Its totient is φ = 63231840.

The previous prime is 81314381. The next prime is 81314399. The reversal of 81314387 is 78341318.

It is not a de Polignac number, because 81314387 - 2²² = 77120083 is a prime.

It is a super-2 number, since 2×81314387² = 13224059066371538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81314381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56189 + ... + 57617.

It is an arithmetic number, because the mean of its divisors is an integer number (6349200).

Almost surely, 2^81314387 is an apocalyptic number.

81314387 is a deficient number, since it is larger than the sum of its proper divisors (20272813).

81314387 is a wasteful number, since it uses less digits than its factorization.

81314387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186.

The product of its digits is 16128, while the sum is 35.

The square root of 81314387 is about 9017.4490295205. The cubic root of 81314387 is about 433.2339317696.

The spelling of 81314387 in words is "eighty-one million, three hundred fourteen thousand, three hundred eighty-seven".