2638194251 has 24 divisors (see below), whose sum is σ = 3524132160. Its totient is φ = 1947531600.

The previous prime is 2638194233. The next prime is 2638194319. The reversal of 2638194251 is 1524918362.

It is a de Polignac number, because none of the positive numbers 2^k-2638194251 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2638194199 and 2638194208.

It is not an unprimeable number, because it can be changed into a prime (2638194851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118565 + ... + 139046.

It is an arithmetic number, because the mean of its divisors is an integer number (146838840).

Almost surely, 2^2638194251 is an apocalyptic number.

2638194251 is a deficient number, since it is larger than the sum of its proper divisors (885937909).

2638194251 is a wasteful number, since it uses less digits than its factorization.

2638194251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257655 (or 257648 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 2638194251 is about 51363.3551376855. The cubic root of 2638194251 is about 1381.7694607498.

The spelling of 2638194251 in words is "two billion, six hundred thirty-eight million, one hundred ninety-four thousand, two hundred fifty-one".