664125131 has 2 divisors, whose sum is σ = 664125132. Its totient is φ = 664125130.

The previous prime is 664125109. The next prime is 664125157. The reversal of 664125131 is 131521466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664125131 - 2¹⁴ = 664108747 is a prime.

It is a super-2 number, since 2×664125131² = 882124379251534322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664125094 and 664125103.

It is not a weakly prime, because it can be changed into another prime (664125101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332062565 + 332062566.

It is an arithmetic number, because the mean of its divisors is an integer number (332062566).

Almost surely, 2^664125131 is an apocalyptic number.

664125131 is a deficient number, since it is larger than the sum of its proper divisors (1).

664125131 is an equidigital number, since it uses as much as digits as its factorization.

664125131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 664125131 is about 25770.6253513569. The cubic root of 664125131 is about 872.4689330843.

Adding to 664125131 its reverse (131521466), we get a palindrome (795646597).

The spelling of 664125131 in words is "six hundred sixty-four million, one hundred twenty-five thousand, one hundred thirty-one".