231304128403 has 2 divisors, whose sum is σ = 231304128404. Its totient is φ = 231304128402.

The previous prime is 231304128397. The next prime is 231304128421. The reversal of 231304128403 is 304821403132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231304128403 - 2³³ = 222714193811 is a prime.

It is a super-2 number, since 2×231304128403² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231304188403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115652064201 + 115652064202.

It is an arithmetic number, because the mean of its divisors is an integer number (115652064202).

Almost surely, 2^231304128403 is an apocalyptic number.

231304128403 is a deficient number, since it is larger than the sum of its proper divisors (1).

231304128403 is an equidigital number, since it uses as much as digits as its factorization.

231304128403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 231304128403 in words is "two hundred thirty-one billion, three hundred four million, one hundred twenty-eight thousand, four hundred three".