2501139861 has 48 divisors (see below), whose sum is σ = 4109114880. Its totient is φ = 1452240000.

The previous prime is 2501139857. The next prime is 2501139863. The reversal of 2501139861 is 1689311052.

2501139861 is a `hidden beast` number, since 2 + 501 + 1 + 3 + 98 + 61 = 666.

It is not a de Polignac number, because 2501139861 - 2² = 2501139857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501139863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 305935 + ... + 314003.

It is an arithmetic number, because the mean of its divisors is an integer number (85606560).

Almost surely, 2^2501139861 is an apocalyptic number.

It is an amenable number.

2501139861 is a deficient number, since it is larger than the sum of its proper divisors (1607975019).

2501139861 is a wasteful number, since it uses less digits than its factorization.

2501139861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8218 (or 8215 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 2501139861 is about 50011.3973110130. The cubic root of 2501139861 is about 1357.4150475413.

The spelling of 2501139861 in words is "two billion, five hundred one million, one hundred thirty-nine thousand, eight hundred sixty-one".