64131251 has 4 divisors (see below), whose sum is σ = 67506600. Its totient is φ = 60755904.

The previous prime is 64131233. The next prime is 64131269. The reversal of 64131251 is 15213146.

64131251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64131233) and next prime (64131269).

It is a cyclic number.

It is not a de Polignac number, because 64131251 - 2¹⁴ = 64114867 is a prime.

It is a super-2 number, since 2×64131251² = 8225634709650002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64131211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687646 + ... + 1687683.

It is an arithmetic number, because the mean of its divisors is an integer number (16876650).

Almost surely, 2^64131251 is an apocalyptic number.

64131251 is a deficient number, since it is larger than the sum of its proper divisors (3375349).

64131251 is a wasteful number, since it uses less digits than its factorization.

64131251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375348.

The product of its digits is 720, while the sum is 23.

The square root of 64131251 is about 8008.1989860392. The cubic root of 64131251 is about 400.2732528730.

Adding to 64131251 its reverse (15213146), we get a palindrome (79344397).

The spelling of 64131251 in words is "sixty-four million, one hundred thirty-one thousand, two hundred fifty-one".