231628907 has 2 divisors, whose sum is σ = 231628908. Its totient is φ = 231628906.

The previous prime is 231628889. The next prime is 231628933. The reversal of 231628907 is 709826132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231628907 - 2¹⁸ = 231366763 is a prime.

It is not a weakly prime, because it can be changed into another prime (231628937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115814453 + 115814454.

It is an arithmetic number, because the mean of its divisors is an integer number (115814454).

Almost surely, 2^231628907 is an apocalyptic number.

231628907 is a deficient number, since it is larger than the sum of its proper divisors (1).

231628907 is an equidigital number, since it uses as much as digits as its factorization.

231628907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 231628907 is about 15219.3596120205. The cubic root of 231628907 is about 614.1355709720.

The spelling of 231628907 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, nine hundred seven".