2638228391 has 2 divisors, whose sum is σ = 2638228392. Its totient is φ = 2638228390.

The previous prime is 2638228349. The next prime is 2638228399. The reversal of 2638228391 is 1938228362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638228391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638228399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319114195 + 1319114196.

It is an arithmetic number, because the mean of its divisors is an integer number (1319114196).

Almost surely, 2^2638228391 is an apocalyptic number.

2638228391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638228391 is an equidigital number, since it uses as much as digits as its factorization.

2638228391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 2638228391 is about 51363.6874747131. The cubic root of 2638228391 is about 1381.7754210647.

The spelling of 2638228391 in words is "two billion, six hundred thirty-eight million, two hundred twenty-eight thousand, three hundred ninety-one".