231220907 has 2 divisors, whose sum is σ = 231220908. Its totient is φ = 231220906.

The previous prime is 231220897. The next prime is 231220919. The reversal of 231220907 is 709022132.

231220907 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231220907 - 2²⁰ = 230172331 is a prime.

It is not a weakly prime, because it can be changed into another prime (231220967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610453 + 115610454.

It is an arithmetic number, because the mean of its divisors is an integer number (115610454).

Almost surely, 2^231220907 is an apocalyptic number.

231220907 is a deficient number, since it is larger than the sum of its proper divisors (1).

231220907 is an equidigital number, since it uses as much as digits as its factorization.

231220907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 231220907 is about 15205.9497237101. The cubic root of 231220907 is about 613.7747717667.

The spelling of 231220907 in words is "two hundred thirty-one million, two hundred twenty thousand, nine hundred seven".