1957197331839 has 4 divisors (see below), whose sum is σ = 2609596442456. Its totient is φ = 1304798221224.

The previous prime is 1957197331723. The next prime is 1957197331861. The reversal of 1957197331839 is 9381337917591.

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

It is not a de Polignac number, because 1957197331839 - 2⁷ = 1957197331711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1957197331839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957197331879) 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, 326199555304 + ... + 326199555309.

It is an arithmetic number, because the mean of its divisors is an integer number (652399110614).

Almost surely, 2^{1957197331839} is an apocalyptic number.

1957197331839 is a deficient number, since it is larger than the sum of its proper divisors (652399110617).

1957197331839 is an equidigital number, since it uses as much as digits as its factorization.

1957197331839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652399110616.

The product of its digits is 38578680, while the sum is 66.

The spelling of 1957197331839 in words is "one trillion, nine hundred fifty-seven billion, one hundred ninety-seven million, three hundred thirty-one thousand, eight hundred thirty-nine".