81464125 has 16 divisors (see below), whose sum is σ = 104951808. Its totient is φ = 63066000.

The previous prime is 81464107. The next prime is 81464177. The reversal of 81464125 is 52146418.

It is not a de Polignac number, because 81464125 - 2⁷ = 81463997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6637 + ... + 14386.

It is an arithmetic number, because the mean of its divisors is an integer number (6559488).

Almost surely, 2^81464125 is an apocalyptic number.

It is an amenable number.

81464125 is a deficient number, since it is larger than the sum of its proper divisors (23487683).

81464125 is a wasteful number, since it uses less digits than its factorization.

81464125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21069 (or 21059 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 81464125 is about 9025.7478914492. The cubic root of 81464125 is about 433.4996977915.

The spelling of 81464125 in words is "eighty-one million, four hundred sixty-four thousand, one hundred twenty-five".