625138447 has 2 divisors, whose sum is σ = 625138448. Its totient is φ = 625138446.

The previous prime is 625138427. The next prime is 625138489. The reversal of 625138447 is 744831526.

625138447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625138447 - 2²⁷ = 490920719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625138417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312569223 + 312569224.

It is an arithmetic number, because the mean of its divisors is an integer number (312569224).

Almost surely, 2^625138447 is an apocalyptic number.

625138447 is a deficient number, since it is larger than the sum of its proper divisors (1).

625138447 is an equidigital number, since it uses as much as digits as its factorization.

625138447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 40.

The square root of 625138447 is about 25002.7687866764. The cubic root of 625138447 is about 855.0510996214.

The spelling of 625138447 in words is "six hundred twenty-five million, one hundred thirty-eight thousand, four hundred forty-seven".