81460651 has 16 divisors (see below), whose sum is σ = 88339680. Its totient is φ = 74833920.

The previous prime is 81460649. The next prime is 81460661. The reversal of 81460651 is 15606418.

It is a cyclic number.

It is not a de Polignac number, because 81460651 - 2¹ = 81460649 is a prime.

It is a super-2 number, since 2×81460651² = 13271675322687602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81460601) 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, 241555 + ... + 241891.

It is an arithmetic number, because the mean of its divisors is an integer number (5521230).

Almost surely, 2^81460651 is an apocalyptic number.

81460651 is a deficient number, since it is larger than the sum of its proper divisors (6879029).

81460651 is a wasteful number, since it uses less digits than its factorization.

81460651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81460651 is about 9025.5554399715. Note that the first 3 decimals coincide. The cubic root of 81460651 is about 433.4935355724.

The spelling of 81460651 in words is "eighty-one million, four hundred sixty thousand, six hundred fifty-one".