531361081 has 2 divisors, whose sum is σ = 531361082. Its totient is φ = 531361080.

The previous prime is 531361073. The next prime is 531361091. The reversal of 531361081 is 180163135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520569856 + 10791225 = 22816^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 531361081 - 2³ = 531361073 is a prime.

It is a super-2 number, since 2×531361081² = 564689196802977122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (531361001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265680540 + 265680541.

It is an arithmetic number, because the mean of its divisors is an integer number (265680541).

Almost surely, 2^531361081 is an apocalyptic number.

It is an amenable number.

531361081 is a deficient number, since it is larger than the sum of its proper divisors (1).

531361081 is an equidigital number, since it uses as much as digits as its factorization.

531361081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 531361081 is about 23051.2707025014. The cubic root of 531361081 is about 809.9593949060.

The spelling of 531361081 in words is "five hundred thirty-one million, three hundred sixty-one thousand, eighty-one".