2157512639 has 2 divisors, whose sum is σ = 2157512640. Its totient is φ = 2157512638.

The previous prime is 2157512633. The next prime is 2157512671. The reversal of 2157512639 is 9362157512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157512639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2157512596 and 2157512605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157512633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078756319 + 1078756320.

It is an arithmetic number, because the mean of its divisors is an integer number (1078756320).

Almost surely, 2^2157512639 is an apocalyptic number.

2157512639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157512639 is an equidigital number, since it uses as much as digits as its factorization.

2157512639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 2157512639 is about 46449.0327025224. The cubic root of 2157512639 is about 1292.1644329867.

The spelling of 2157512639 in words is "two billion, one hundred fifty-seven million, five hundred twelve thousand, six hundred thirty-nine".