2521660531 has 16 divisors (see below), whose sum is σ = 2777241600. Its totient is φ = 2275327008.

The previous prime is 2521660483. The next prime is 2521660573. The reversal of 2521660531 is 1350661252.

It is a cyclic number.

It is not a de Polignac number, because 2521660531 - 2¹³ = 2521652339 is a prime.

It is a super-2 number, since 2×2521660531² = 12717543667206403922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2521660493 and 2521660502.

It is not an unprimeable number, because it can be changed into a prime (2521660231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128110 + ... + 146476.

It is an arithmetic number, because the mean of its divisors is an integer number (173577600).

Almost surely, 2^2521660531 is an apocalyptic number.

2521660531 is a deficient number, since it is larger than the sum of its proper divisors (255581069).

2521660531 is a wasteful number, since it uses less digits than its factorization.

2521660531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18618.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2521660531 is about 50216.1381529882. The cubic root of 2521660531 is about 1361.1172571889.

The spelling of 2521660531 in words is "two billion, five hundred twenty-one million, six hundred sixty thousand, five hundred thirty-one".