531079561 has 2 divisors, whose sum is σ = 531079562. Its totient is φ = 531079560.

The previous prime is 531079553. The next prime is 531079613. The reversal of 531079561 is 165970135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316163961 + 214915600 = 17781^2 + 14660^2 .

It is a cyclic number.

It is not a de Polignac number, because 531079561 - 2³ = 531079553 is a prime.

It is a super-2 number, since 2×531079561² = 564091000223905442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 531079561.

It is not a weakly prime, because it can be changed into another prime (531079261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265539780 + 265539781.

It is an arithmetic number, because the mean of its divisors is an integer number (265539781).

Almost surely, 2^531079561 is an apocalyptic number.

It is an amenable number.

531079561 is a deficient number, since it is larger than the sum of its proper divisors (1).

531079561 is an equidigital number, since it uses as much as digits as its factorization.

531079561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 531079561 is about 23045.1635056035. The cubic root of 531079561 is about 809.8163283186.

The spelling of 531079561 in words is "five hundred thirty-one million, seventy-nine thousand, five hundred sixty-one".