531137081 has 4 divisors (see below), whose sum is σ = 535014132. Its totient is φ = 527260032.

The previous prime is 531137021. The next prime is 531137093. The reversal of 531137081 is 180731135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212693056 + 318444025 = 14584^2 + 17845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531137081 is a prime.

It is a super-2 number, since 2×531137081² = 564213197626401122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531137021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1938320 + ... + 1938593.

It is an arithmetic number, because the mean of its divisors is an integer number (133753533).

Almost surely, 2^531137081 is an apocalyptic number.

It is an amenable number.

531137081 is a deficient number, since it is larger than the sum of its proper divisors (3877051).

531137081 is a wasteful number, since it uses less digits than its factorization.

531137081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877050.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 531137081 is about 23046.4114560163. The cubic root of 531137081 is about 809.8455637082.

The spelling of 531137081 in words is "five hundred thirty-one million, one hundred thirty-seven thousand, eighty-one".