1957191121 has 8 divisors (see below), whose sum is σ = 2131243200. Its totient is φ = 1790243280.

The previous prime is 1957191077. The next prime is 1957191143. The reversal of 1957191121 is 1211917591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1957191121 - 2⁷ = 1957190993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1957192121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775485 + ... + 1776586.

It is an arithmetic number, because the mean of its divisors is an integer number (266405400).

Almost surely, 2^1957191121 is an apocalyptic number.

It is an amenable number.

1957191121 is a deficient number, since it is larger than the sum of its proper divisors (174052079).

1957191121 is a wasteful number, since it uses less digits than its factorization.

1957191121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552119.

The product of its digits is 5670, while the sum is 37.

The square root of 1957191121 is about 44240.1528139314. The cubic root of 1957191121 is about 1250.8668378814.

The spelling of 1957191121 in words is "one billion, nine hundred fifty-seven million, one hundred ninety-one thousand, one hundred twenty-one".