919328231 has 2 divisors, whose sum is σ = 919328232. Its totient is φ = 919328230.

The previous prime is 919328209. The next prime is 919328237. The reversal of 919328231 is 132823919.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-919328231 is a prime.

It is a super-2 number, since 2×919328231² = 1690328792627178722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919328237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459664115 + 459664116.

It is an arithmetic number, because the mean of its divisors is an integer number (459664116).

Almost surely, 2^919328231 is an apocalyptic number.

919328231 is a deficient number, since it is larger than the sum of its proper divisors (1).

919328231 is an equidigital number, since it uses as much as digits as its factorization.

919328231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 919328231 is about 30320.4259699629. The cubic root of 919328231 is about 972.3520457439.

The spelling of 919328231 in words is "nine hundred nineteen million, three hundred twenty-eight thousand, two hundred thirty-one".