2638676291 has 4 divisors (see below), whose sum is σ = 2641463592. Its totient is φ = 2635888992.

The previous prime is 2638676279. The next prime is 2638676309. The reversal of 2638676291 is 1926768362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1926768362 = 2 ⋅963384181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638676291 is a prime.

It is a super-2 number, since 2×2638676291² = 13925225137371033362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638676591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392230 + ... + 1394123.

It is an arithmetic number, because the mean of its divisors is an integer number (660365898).

Almost surely, 2^2638676291 is an apocalyptic number.

2638676291 is a deficient number, since it is larger than the sum of its proper divisors (2787301).

2638676291 is an equidigital number, since it uses as much as digits as its factorization.

2638676291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787300.

The product of its digits is 1306368, while the sum is 50.

The square root of 2638676291 is about 51368.0473738296. The cubic root of 2638676291 is about 1381.8536127018.

The spelling of 2638676291 in words is "two billion, six hundred thirty-eight million, six hundred seventy-six thousand, two hundred ninety-one".