231201913 has 2 divisors, whose sum is σ = 231201914. Its totient is φ = 231201912.

The previous prime is 231201889. The next prime is 231201941. The reversal of 231201913 is 319102132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177502329 + 53699584 = 13323^2 + 7328^2 .

It is a cyclic number.

It is not a de Polignac number, because 231201913 - 2⁵ = 231201881 is a prime.

It is not a weakly prime, because it can be changed into another prime (231201973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115600956 + 115600957.

It is an arithmetic number, because the mean of its divisors is an integer number (115600957).

Almost surely, 2^231201913 is an apocalyptic number.

It is an amenable number.

231201913 is a deficient number, since it is larger than the sum of its proper divisors (1).

231201913 is an equidigital number, since it uses as much as digits as its factorization.

231201913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 231201913 is about 15205.3251527220. The cubic root of 231201913 is about 613.7579648130.

The spelling of 231201913 in words is "two hundred thirty-one million, two hundred one thousand, nine hundred thirteen".