531415231 has 2 divisors, whose sum is σ = 531415232. Its totient is φ = 531415230.

The previous prime is 531415211. The next prime is 531415243. The reversal of 531415231 is 132514135.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531415231 - 2²⁵ = 497860799 is a prime.

It is a super-2 number, since 2×531415231² = 564804295477566722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 531415196 and 531415205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531415211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265707615 + 265707616.

It is an arithmetic number, because the mean of its divisors is an integer number (265707616).

Almost surely, 2^531415231 is an apocalyptic number.

531415231 is a deficient number, since it is larger than the sum of its proper divisors (1).

531415231 is an equidigital number, since it uses as much as digits as its factorization.

531415231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 531415231 is about 23052.4452282182. The cubic root of 531415231 is about 809.9869077801.

Adding to 531415231 its reverse (132514135), we get a palindrome (663929366).

The spelling of 531415231 in words is "five hundred thirty-one million, four hundred fifteen thousand, two hundred thirty-one".