2157674639 has 2 divisors, whose sum is σ = 2157674640. Its totient is φ = 2157674638.

The previous prime is 2157674627. The next prime is 2157674641. The reversal of 2157674639 is 9364767512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157674639 - 2⁸ = 2157674383 is a prime.

Together with 2157674641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157674699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078837319 + 1078837320.

It is an arithmetic number, because the mean of its divisors is an integer number (1078837320).

Almost surely, 2^2157674639 is an apocalyptic number.

2157674639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157674639 is an equidigital number, since it uses as much as digits as its factorization.

2157674639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 50.

The square root of 2157674639 is about 46450.7765166525. The cubic root of 2157674639 is about 1292.1967735310.

The spelling of 2157674639 in words is "two billion, one hundred fifty-seven million, six hundred seventy-four thousand, six hundred thirty-nine".