3991597057 has 4 divisors (see below), whose sum is σ = 4561825216. Its totient is φ = 3421368900.

The previous prime is 3991597009. The next prime is 3991597061. The reversal of 3991597057 is 7507951993.

3991597057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 3991597057 - 2²⁷ = 3857379329 is a prime.

It is a super-2 number, since 2×3991597057² = 31865694130902122498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3991596989 and 3991597007.

It is not an unprimeable number, because it can be changed into a prime (3991597087) 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, 285114069 + ... + 285114082.

It is an arithmetic number, because the mean of its divisors is an integer number (1140456304).

Almost surely, 2^3991597057 is an apocalyptic number.

It is an amenable number.

3991597057 is a deficient number, since it is larger than the sum of its proper divisors (570228159).

3991597057 is an equidigital number, since it uses as much as digits as its factorization.

3991597057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570228158.

The product of its (nonzero) digits is 2679075, while the sum is 55.

The square root of 3991597057 is about 63179.0871808069. The cubic root of 3991597057 is about 1586.2887026404.

The spelling of 3991597057 in words is "three billion, nine hundred ninety-one million, five hundred ninety-seven thousand, fifty-seven".