2157057887 has 4 divisors (see below), whose sum is σ = 2187439056. Its totient is φ = 2126676720.

The previous prime is 2157057871. The next prime is 2157057893. The reversal of 2157057887 is 7887507512.

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 2157057887 - 2⁴ = 2157057871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157057817) 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, 15190478 + ... + 15190619.

It is an arithmetic number, because the mean of its divisors is an integer number (546859764).

Almost surely, 2^2157057887 is an apocalyptic number.

2157057887 is a deficient number, since it is larger than the sum of its proper divisors (30381169).

2157057887 is an equidigital number, since it uses as much as digits as its factorization.

2157057887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30381168.

The product of its (nonzero) digits is 1097600, while the sum is 50.

The square root of 2157057887 is about 46444.1372726419. The cubic root of 2157057887 is about 1292.0736408342.

The spelling of 2157057887 in words is "two billion, one hundred fifty-seven million, fifty-seven thousand, eight hundred eighty-seven".