2651513891 has 4 divisors (see below), whose sum is σ = 2855476512. Its totient is φ = 2447551272.

The previous prime is 2651513873. The next prime is 2651513903. The reversal of 2651513891 is 1983151562.

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 2651513891 - 2¹⁸ = 2651251747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2651513801) 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, 101981291 + ... + 101981316.

It is an arithmetic number, because the mean of its divisors is an integer number (713869128).

Almost surely, 2^2651513891 is an apocalyptic number.

2651513891 is a deficient number, since it is larger than the sum of its proper divisors (203962621).

2651513891 is a wasteful number, since it uses less digits than its factorization.

2651513891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203962620.

The product of its digits is 64800, while the sum is 41.

The square root of 2651513891 is about 51492.8528147354. The cubic root of 2651513891 is about 1384.0909709644.

The spelling of 2651513891 in words is "two billion, six hundred fifty-one million, five hundred thirteen thousand, eight hundred ninety-one".