657672139 has 2 divisors, whose sum is σ = 657672140. Its totient is φ = 657672138.

The previous prime is 657672107. The next prime is 657672187. The reversal of 657672139 is 931276756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 657672139 - 2⁵ = 657672107 is a prime.

It is not a weakly prime, because it can be changed into another prime (657672539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328836069 + 328836070.

It is an arithmetic number, because the mean of its divisors is an integer number (328836070).

Almost surely, 2^657672139 is an apocalyptic number.

657672139 is a deficient number, since it is larger than the sum of its proper divisors (1).

657672139 is an equidigital number, since it uses as much as digits as its factorization.

657672139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 46.

The square root of 657672139 is about 25645.1192042463. The cubic root of 657672139 is about 869.6339407719.

The spelling of 657672139 in words is "six hundred fifty-seven million, six hundred seventy-two thousand, one hundred thirty-nine".