2857291391 has 4 divisors (see below), whose sum is σ = 2923740072. Its totient is φ = 2790842712.

The previous prime is 2857291387. The next prime is 2857291397. The reversal of 2857291391 is 1931927582.

It is a happy number.

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 2857291391 - 2² = 2857291387 is a prime.

It is a super-2 number, since 2×2857291391² = 16328228186165429762, 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 (2857291397) 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, 33224276 + ... + 33224361.

It is an arithmetic number, because the mean of its divisors is an integer number (730935018).

Almost surely, 2^2857291391 is an apocalyptic number.

2857291391 is a deficient number, since it is larger than the sum of its proper divisors (66448681).

2857291391 is an equidigital number, since it uses as much as digits as its factorization.

2857291391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66448680.

The product of its digits is 272160, while the sum is 47.

The square root of 2857291391 is about 53453.6377714370. The cubic root of 2857291391 is about 1419.0080010369.

The spelling of 2857291391 in words is "two billion, eight hundred fifty-seven million, two hundred ninety-one thousand, three hundred ninety-one".