2157633879 has 4 divisors (see below), whose sum is σ = 2876845176. Its totient is φ = 1438422584.

The previous prime is 2157633851. The next prime is 2157633889. The reversal of 2157633879 is 9783367512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2157633879 - 2¹⁵ = 2157601111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157633809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359605644 + ... + 359605649.

It is an arithmetic number, because the mean of its divisors is an integer number (719211294).

Almost surely, 2^2157633879 is an apocalyptic number.

2157633879 is a deficient number, since it is larger than the sum of its proper divisors (719211297).

2157633879 is an equidigital number, since it uses as much as digits as its factorization.

2157633879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719211296.

The product of its digits is 1905120, while the sum is 51.

The square root of 2157633879 is about 46450.3377705695. The cubic root of 2157633879 is about 1292.1886366428.

It can be divided in two parts, 2157633 and 879, that added together give a palindrome (2158512).

The spelling of 2157633879 in words is "two billion, one hundred fifty-seven million, six hundred thirty-three thousand, eight hundred seventy-nine".