231139511 has 2 divisors, whose sum is σ = 231139512. Its totient is φ = 231139510.

The previous prime is 231139507. The next prime is 231139537. The reversal of 231139511 is 115931132.

It is an a-pointer prime, because the next prime (231139537) can be obtained adding 231139511 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231139511 - 2² = 231139507 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231139501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115569755 + 115569756.

It is an arithmetic number, because the mean of its divisors is an integer number (115569756).

Almost surely, 2^231139511 is an apocalyptic number.

231139511 is a deficient number, since it is larger than the sum of its proper divisors (1).

231139511 is an equidigital number, since it uses as much as digits as its factorization.

231139511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 26.

The square root of 231139511 is about 15203.2730357644. The cubic root of 231139511 is about 613.7027415520.

The spelling of 231139511 in words is "two hundred thirty-one million, one hundred thirty-nine thousand, five hundred eleven".