236428991 has 2 divisors, whose sum is σ = 236428992. Its totient is φ = 236428990.

The previous prime is 236428961. The next prime is 236429041. The reversal of 236428991 is 199824632.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 236428991 - 2¹⁰ = 236427967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (236428901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118214495 + 118214496.

It is an arithmetic number, because the mean of its divisors is an integer number (118214496).

Almost surely, 2^236428991 is an apocalyptic number.

236428991 is a deficient number, since it is larger than the sum of its proper divisors (1).

236428991 is an equidigital number, since it uses as much as digits as its factorization.

236428991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 236428991 is about 15376.2476241767. The cubic root of 236428991 is about 618.3488768253.

The spelling of 236428991 in words is "two hundred thirty-six million, four hundred twenty-eight thousand, nine hundred ninety-one".