3131428665 has 32 divisors (see below), whose sum is σ = 5280537600. Its totient is φ = 1580230080.

The previous prime is 3131428661. The next prime is 3131428673. The reversal of 3131428665 is 5668241313.

It is not a de Polignac number, because 3131428665 - 2² = 3131428661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3131428661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238420 + ... + 251210.

It is an arithmetic number, because the mean of its divisors is an integer number (165016800).

Almost surely, 2^3131428665 is an apocalyptic number.

It is an amenable number.

3131428665 is a deficient number, since it is larger than the sum of its proper divisors (2149108935).

3131428665 is a wasteful number, since it uses less digits than its factorization.

3131428665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13677.

The product of its digits is 103680, while the sum is 39.

The square root of 3131428665 is about 55959.1696239321. The cubic root of 3131428665 is about 1463.0107173881.

Adding to 3131428665 its reverse (5668241313), we get a palindrome (8799669978).

The spelling of 3131428665 in words is "three billion, one hundred thirty-one million, four hundred twenty-eight thousand, six hundred sixty-five".