215625139 has 2 divisors, whose sum is σ = 215625140. Its totient is φ = 215625138.

The previous prime is 215625133. The next prime is 215625169. The reversal of 215625139 is 931526512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215625139 - 2⁹ = 215624627 is a prime.

It is not a weakly prime, because it can be changed into another prime (215625133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107812569 + 107812570.

It is an arithmetic number, because the mean of its divisors is an integer number (107812570).

Almost surely, 2^215625139 is an apocalyptic number.

215625139 is a deficient number, since it is larger than the sum of its proper divisors (1).

215625139 is an equidigital number, since it uses as much as digits as its factorization.

215625139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 215625139 is about 14684.1798885740. The cubic root of 215625139 is about 599.6527054978.

The spelling of 215625139 in words is "two hundred fifteen million, six hundred twenty-five thousand, one hundred thirty-nine".