64139121 has 24 divisors (see below), whose sum is σ = 97674304. Its totient is φ = 42048720.

The previous prime is 64139087. The next prime is 64139149. The reversal of 64139121 is 12193146.

64139121 is a `hidden beast` number, since 641 + 3 + 9 + 12 + 1 = 666.

It is not a de Polignac number, because 64139121 - 2⁷ = 64138993 is a prime.

It is a super-2 number, since 2×64139121² = 8227653685305282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64139921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12660 + ... + 16986.

Almost surely, 2^64139121 is an apocalyptic number.

64139121 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64139121 is a deficient number, since it is larger than the sum of its proper divisors (33535183).

64139121 is an equidigital number, since it uses as much as digits as its factorization.

64139121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403 (or 4391 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 64139121 is about 8008.6903423718. The cubic root of 64139121 is about 400.2896256585.

The spelling of 64139121 in words is "sixty-four million, one hundred thirty-nine thousand, one hundred twenty-one".