231621131003 has 2 divisors, whose sum is σ = 231621131004. Its totient is φ = 231621131002.

The previous prime is 231621130999. The next prime is 231621131051. The reversal of 231621131003 is 300131126132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231621131003 - 2² = 231621130999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231621131003.

It is not a weakly prime, because it can be changed into another prime (231621137003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115810565501 + 115810565502.

It is an arithmetic number, because the mean of its divisors is an integer number (115810565502).

Almost surely, 2^231621131003 is an apocalyptic number.

231621131003 is a deficient number, since it is larger than the sum of its proper divisors (1).

231621131003 is an equidigital number, since it uses as much as digits as its factorization.

231621131003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 231621131003 its reverse (300131126132), we get a palindrome (531752257135).

The spelling of 231621131003 in words is "two hundred thirty-one billion, six hundred twenty-one million, one hundred thirty-one thousand, three".