64125491 has 4 divisors (see below), whose sum is σ = 64218984. Its totient is φ = 64032000.

The previous prime is 64125487. The next prime is 64125493. The reversal of 64125491 is 19452146.

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 64125491 - 2² = 64125487 is a prime.

It is a super-2 number, since 2×64125491² = 8224157191982162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64125493) 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, 45710 + ... + 47091.

It is an arithmetic number, because the mean of its divisors is an integer number (16054746).

Almost surely, 2^64125491 is an apocalyptic number.

64125491 is a deficient number, since it is larger than the sum of its proper divisors (93493).

64125491 is an equidigital number, since it uses as much as digits as its factorization.

64125491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93492.

The product of its digits is 8640, while the sum is 32.

The square root of 64125491 is about 8007.8393465404. The cubic root of 64125491 is about 400.2612688926.

The spelling of 64125491 in words is "sixty-four million, one hundred twenty-five thousand, four hundred ninety-one".