81351927 has 12 divisors (see below), whose sum is σ = 117591760. Its totient is φ = 54196128.

The previous prime is 81351899. The next prime is 81351929. The reversal of 81351927 is 72915318.

It is not a de Polignac number, because 81351927 - 2⁷ = 81351799 is a prime.

It is a super-2 number, since 2×81351927² = 13236272053226658, 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 = 81351891 and 81351900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81351929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16638 + ... + 20964.

Almost surely, 2^81351927 is an apocalyptic number.

81351927 is a deficient number, since it is larger than the sum of its proper divisors (36239833).

81351927 is a wasteful number, since it uses less digits than its factorization.

81351927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6422 (or 6419 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 81351927 is about 9019.5303092789. The cubic root of 81351927 is about 433.3005911487.

The spelling of 81351927 in words is "eighty-one million, three hundred fifty-one thousand, nine hundred twenty-seven".