2561512531 has 4 divisors (see below), whose sum is σ = 2696329000. Its totient is φ = 2426696064.

The previous prime is 2561512501. The next prime is 2561512559. The reversal of 2561512531 is 1352151652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561512531 - 2²⁷ = 2427294803 is a prime.

It is a super-2 number, since 2×2561512531² = 13122692892940051922, 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 = 2561512493 and 2561512502.

It is not an unprimeable number, because it can be changed into a prime (2561512501) 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, 67408206 + ... + 67408243.

It is an arithmetic number, because the mean of its divisors is an integer number (674082250).

Almost surely, 2^2561512531 is an apocalyptic number.

2561512531 is a deficient number, since it is larger than the sum of its proper divisors (134816469).

2561512531 is a wasteful number, since it uses less digits than its factorization.

2561512531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134816468.

The product of its digits is 9000, while the sum is 31.

The square root of 2561512531 is about 50611.3873649004. The cubic root of 2561512531 is about 1368.2501200936.

The spelling of 2561512531 in words is "two billion, five hundred sixty-one million, five hundred twelve thousand, five hundred thirty-one".