231621131051 has 2 divisors, whose sum is σ = 231621131052. Its totient is φ = 231621131050.

The previous prime is 231621131003. The next prime is 231621131081. The reversal of 231621131051 is 150131126132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231621131051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231621131051.

It is not a weakly prime, because it can be changed into another prime (231621131081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115810565525 + 115810565526.

It is an arithmetic number, because the mean of its divisors is an integer number (115810565526).

Almost surely, 2^231621131051 is an apocalyptic number.

231621131051 is a deficient number, since it is larger than the sum of its proper divisors (1).

231621131051 is an equidigital number, since it uses as much as digits as its factorization.

231621131051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 231621131051 its reverse (150131126132), we get a palindrome (381752257183).

The spelling of 231621131051 in words is "two hundred thirty-one billion, six hundred twenty-one million, one hundred thirty-one thousand, fifty-one".