3131665491 has 4 divisors (see below), whose sum is σ = 4175553992. Its totient is φ = 2087776992.

The previous prime is 3131665417. The next prime is 3131665501. The reversal of 3131665491 is 1945661313.

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

It is not a de Polignac number, because 3131665491 - 2⁷ = 3131665363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131665391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521944246 + ... + 521944251.

It is an arithmetic number, because the mean of its divisors is an integer number (1043888498).

Almost surely, 2^3131665491 is an apocalyptic number.

3131665491 is a deficient number, since it is larger than the sum of its proper divisors (1043888501).

3131665491 is a wasteful number, since it uses less digits than its factorization.

3131665491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043888500.

The product of its digits is 58320, while the sum is 39.

The square root of 3131665491 is about 55961.2856446311. The cubic root of 3131665491 is about 1463.0475983434.

The spelling of 3131665491 in words is "three billion, one hundred thirty-one million, six hundred sixty-five thousand, four hundred ninety-one".