239992091 has 2 divisors, whose sum is σ = 239992092. Its totient is φ = 239992090.

The previous prime is 239992069. The next prime is 239992121. The reversal of 239992091 is 190299932.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239992091 is a prime.

It is not a weakly prime, because it can be changed into another prime (239992061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119996045 + 119996046.

It is an arithmetic number, because the mean of its divisors is an integer number (119996046).

Almost surely, 2^239992091 is an apocalyptic number.

239992091 is a deficient number, since it is larger than the sum of its proper divisors (1).

239992091 is an equidigital number, since it uses as much as digits as its factorization.

239992091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 239992091 is about 15491.6781208493. The cubic root of 239992091 is about 621.4396746986.

The spelling of 239992091 in words is "two hundred thirty-nine million, nine hundred ninety-two thousand, ninety-one".