531399023 has 2 divisors, whose sum is σ = 531399024. Its totient is φ = 531399022.

The previous prime is 531399019. The next prime is 531399079. The reversal of 531399023 is 320993135.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531399023 - 2² = 531399019 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531399223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265699511 + 265699512.

It is an arithmetic number, because the mean of its divisors is an integer number (265699512).

Almost surely, 2^531399023 is an apocalyptic number.

531399023 is a deficient number, since it is larger than the sum of its proper divisors (1).

531399023 is an equidigital number, since it uses as much as digits as its factorization.

531399023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 35.

The square root of 531399023 is about 23052.0936793169. The cubic root of 531399023 is about 809.9786729130.

The spelling of 531399023 in words is "five hundred thirty-one million, three hundred ninety-nine thousand, twenty-three".