531555923 has 2 divisors, whose sum is σ = 531555924. Its totient is φ = 531555922.

The previous prime is 531555919. The next prime is 531556009. The reversal of 531555923 is 329555135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531555923 - 2² = 531555919 is a prime.

It is not a weakly prime, because it can be changed into another prime (531555523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265777961 + 265777962.

It is an arithmetic number, because the mean of its divisors is an integer number (265777962).

Almost surely, 2^531555923 is an apocalyptic number.

531555923 is a deficient number, since it is larger than the sum of its proper divisors (1).

531555923 is an equidigital number, since it uses as much as digits as its factorization.

531555923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101250, while the sum is 38.

The square root of 531555923 is about 23055.4965897506. The cubic root of 531555923 is about 810.0583827247.

The spelling of 531555923 in words is "five hundred thirty-one million, five hundred fifty-five thousand, nine hundred twenty-three".