231815011 has 2 divisors, whose sum is σ = 231815012. Its totient is φ = 231815010.

The previous prime is 231814969. The next prime is 231815033. The reversal of 231815011 is 110518132.

It is an a-pointer prime, because the next prime (231815033) can be obtained adding 231815011 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231815011 - 2²³ = 223426403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231815411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115907505 + 115907506.

It is an arithmetic number, because the mean of its divisors is an integer number (115907506).

Almost surely, 2^231815011 is an apocalyptic number.

231815011 is a deficient number, since it is larger than the sum of its proper divisors (1).

231815011 is an equidigital number, since it uses as much as digits as its factorization.

231815011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 231815011 is about 15225.4724393038. The cubic root of 231815011 is about 614.3000042337.

The spelling of 231815011 in words is "two hundred thirty-one million, eight hundred fifteen thousand, eleven".