64251131 has 4 divisors (see below), whose sum is σ = 73429872. Its totient is φ = 55072392.

The previous prime is 64251113. The next prime is 64251133. The reversal of 64251131 is 13115246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13115246 = 2 ⋅6557623.

It is a cyclic number.

It is not a de Polignac number, because 64251131 - 2¹⁴ = 64234747 is a prime.

It is a super-2 number, since 2×64251131² = 8256415669558322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64251097 and 64251106.

It is not an unprimeable number, because it can be changed into a prime (64251133) 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, 4589360 + ... + 4589373.

It is an arithmetic number, because the mean of its divisors is an integer number (18357468).

Almost surely, 2^64251131 is an apocalyptic number.

64251131 is a deficient number, since it is larger than the sum of its proper divisors (9178741).

64251131 is an equidigital number, since it uses as much as digits as its factorization.

64251131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9178740.

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

The square root of 64251131 is about 8015.6803204719. The cubic root of 64251131 is about 400.5225067529.

Adding to 64251131 its reverse (13115246), we get a palindrome (77366377).

The spelling of 64251131 in words is "sixty-four million, two hundred fifty-one thousand, one hundred thirty-one".