215134639 has 2 divisors, whose sum is σ = 215134640. Its totient is φ = 215134638.

The previous prime is 215134607. The next prime is 215134649. The reversal of 215134639 is 936431512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215134639 - 2⁵ = 215134607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215134649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107567319 + 107567320.

It is an arithmetic number, because the mean of its divisors is an integer number (107567320).

Almost surely, 2^215134639 is an apocalyptic number.

215134639 is a deficient number, since it is larger than the sum of its proper divisors (1).

215134639 is an equidigital number, since it uses as much as digits as its factorization.

215134639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 215134639 is about 14667.4687318569. The cubic root of 215134639 is about 599.1976673970.

The spelling of 215134639 in words is "two hundred fifteen million, one hundred thirty-four thousand, six hundred thirty-nine".