625986139 has 2 divisors, whose sum is σ = 625986140. Its totient is φ = 625986138.

The previous prime is 625986133. The next prime is 625986143. The reversal of 625986139 is 931689526.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 625986139 - 2⁹ = 625985627 is a prime.

It is a super-3 number, since 3×625986139³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 625986092 and 625986101.

It is not a weakly prime, because it can be changed into another prime (625986133) 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, 312993069 + 312993070.

It is an arithmetic number, because the mean of its divisors is an integer number (312993070).

Almost surely, 2^625986139 is an apocalyptic number.

625986139 is a deficient number, since it is larger than the sum of its proper divisors (1).

625986139 is an equidigital number, since it uses as much as digits as its factorization.

625986139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 625986139 is about 25019.7150063705. The cubic root of 625986139 is about 855.4374101027.

The spelling of 625986139 in words is "six hundred twenty-five million, nine hundred eighty-six thousand, one hundred thirty-nine".