2521131861 has 12 divisors (see below), whose sum is σ = 3445503776. Its totient is φ = 1639757280.

The previous prime is 2521131859. The next prime is 2521131883. The reversal of 2521131861 is 1681311252.

2521131861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2521131861 - 2¹ = 2521131859 is a prime.

It is a super-2 number, since 2×2521131861² = 12712211721098646642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521131061) 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, 244921 + ... + 255006.

Almost surely, 2^2521131861 is an apocalyptic number.

It is an amenable number.

2521131861 is a deficient number, since it is larger than the sum of its proper divisors (924371915).

2521131861 is an equidigital number, since it uses as much as digits as its factorization.

2521131861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500012 (or 499971 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 2521131861 is about 50210.8739318487. The cubic root of 2521131861 is about 1361.0221304335.

The spelling of 2521131861 in words is "two billion, five hundred twenty-one million, one hundred thirty-one thousand, eight hundred sixty-one".