231148909 has 2 divisors, whose sum is σ = 231148910. Its totient is φ = 231148908.

The previous prime is 231148891. The next prime is 231148921. The reversal of 231148909 is 909841132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173054025 + 58094884 = 13155^2 + 7622^2 .

It is a cyclic number.

It is not a de Polignac number, because 231148909 - 2²³ = 222760301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231148969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115574454 + 115574455.

It is an arithmetic number, because the mean of its divisors is an integer number (115574455).

Almost surely, 2^231148909 is an apocalyptic number.

It is an amenable number.

231148909 is a deficient number, since it is larger than the sum of its proper divisors (1).

231148909 is an equidigital number, since it uses as much as digits as its factorization.

231148909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 231148909 is about 15203.5821108053. The cubic root of 231148909 is about 613.7110590398.

It can be divided in two parts, 23114 and 8909, that added together give a palindrome (32023).

The spelling of 231148909 in words is "two hundred thirty-one million, one hundred forty-eight thousand, nine hundred nine".