2157246277 has 4 divisors (see below), whose sum is σ = 2183237280. Its totient is φ = 2131255276.

The previous prime is 2157246241. The next prime is 2157246281. The reversal of 2157246277 is 7726427512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157246277 is a prime.

It is a super-2 number, since 2×2157246277² = 9307422999260721458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157246877) 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, 12995377 + ... + 12995542.

It is an arithmetic number, because the mean of its divisors is an integer number (545809320).

Almost surely, 2^2157246277 is an apocalyptic number.

It is an amenable number.

2157246277 is a deficient number, since it is larger than the sum of its proper divisors (25991003).

2157246277 is an equidigital number, since it uses as much as digits as its factorization.

2157246277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25991002.

The product of its digits is 329280, while the sum is 43.

The square root of 2157246277 is about 46446.1653637843. The cubic root of 2157246277 is about 1292.1112548251. Note that the first 3 decimals are identical.

The spelling of 2157246277 in words is "two billion, one hundred fifty-seven million, two hundred forty-six thousand, two hundred seventy-seven".