231628511 has 2 divisors, whose sum is σ = 231628512. Its totient is φ = 231628510.

The previous prime is 231628493. The next prime is 231628517. The reversal of 231628511 is 115826132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231628511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231628517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115814255 + 115814256.

It is an arithmetic number, because the mean of its divisors is an integer number (115814256).

Almost surely, 2^231628511 is an apocalyptic number.

231628511 is a deficient number, since it is larger than the sum of its proper divisors (1).

231628511 is an equidigital number, since it uses as much as digits as its factorization.

231628511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 231628511 is about 15219.3466022691. The cubic root of 231628511 is about 614.1352209900.

The spelling of 231628511 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, five hundred eleven".