3991459313 has 4 divisors (see below), whose sum is σ = 3992479140. Its totient is φ = 3990439488.

The previous prime is 3991459301. The next prime is 3991459379. The reversal of 3991459313 is 3139541993.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 698650624 + 3292808689 = 26432^2 + 57383^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991459313 - 2⁸ = 3991459057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991450313) 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, 504020 + ... + 511877.

It is an arithmetic number, because the mean of its divisors is an integer number (998119785).

Almost surely, 2^3991459313 is an apocalyptic number.

It is an amenable number.

3991459313 is a deficient number, since it is larger than the sum of its proper divisors (1019827).

3991459313 is a wasteful number, since it uses less digits than its factorization.

3991459313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019826.

The product of its digits is 393660, while the sum is 47.

The square root of 3991459313 is about 63177.9970638513. The cubic root of 3991459313 is about 1586.2704556195.

The spelling of 3991459313 in words is "three billion, nine hundred ninety-one million, four hundred fifty-nine thousand, three hundred thirteen".