2531125821 has 12 divisors (see below), whose sum is σ = 3925828032. Its totient is φ = 1446357528.

The previous prime is 2531125769. The next prime is 2531125841. The reversal of 2531125821 is 1285211352.

It is not a de Polignac number, because 2531125821 - 2⁹ = 2531125309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531125841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8609125 + ... + 8609418.

It is an arithmetic number, because the mean of its divisors is an integer number (327152336).

Almost surely, 2^2531125821 is an apocalyptic number.

2531125821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2531125821 is a deficient number, since it is larger than the sum of its proper divisors (1394702211).

2531125821 is a wasteful number, since it uses less digits than its factorization.

2531125821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218560 (or 17218553 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 2531125821 is about 50310.2953777853. The cubic root of 2531125821 is about 1362.8181580159.

The spelling of 2531125821 in words is "two billion, five hundred thirty-one million, one hundred twenty-five thousand, eight hundred twenty-one".