625973137 has 2 divisors, whose sum is σ = 625973138. Its totient is φ = 625973136.

The previous prime is 625973113. The next prime is 625973143. The reversal of 625973137 is 731379526.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478690641 + 147282496 = 21879^2 + 12136^2 .

It is a cyclic number.

It is not a de Polignac number, because 625973137 - 2⁷ = 625973009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 625973093 and 625973102.

It is not a weakly prime, because it can be changed into another prime (625973237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312986568 + 312986569.

It is an arithmetic number, because the mean of its divisors is an integer number (312986569).

Almost surely, 2^625973137 is an apocalyptic number.

It is an amenable number.

625973137 is a deficient number, since it is larger than the sum of its proper divisors (1).

625973137 is an equidigital number, since it uses as much as digits as its factorization.

625973137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 43.

The square root of 625973137 is about 25019.4551699273. The cubic root of 625973137 is about 855.4314874613.

The spelling of 625973137 in words is "six hundred twenty-five million, nine hundred seventy-three thousand, one hundred thirty-seven".