215239919 has 2 divisors, whose sum is σ = 215239920. Its totient is φ = 215239918.

The previous prime is 215239883. The next prime is 215239933. The reversal of 215239919 is 919932512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215239919 - 2⁸ = 215239663 is a prime.

It is a super-2 number, since 2×215239919² = 92656445462253122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215239019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107619959 + 107619960.

It is an arithmetic number, because the mean of its divisors is an integer number (107619960).

Almost surely, 2^215239919 is an apocalyptic number.

215239919 is a deficient number, since it is larger than the sum of its proper divisors (1).

215239919 is an equidigital number, since it uses as much as digits as its factorization.

215239919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 41.

The square root of 215239919 is about 14671.0571875376. The cubic root of 215239919 is about 599.2953941712.

The spelling of 215239919 in words is "two hundred fifteen million, two hundred thirty-nine thousand, nine hundred nineteen".