3131621632 has 18 divisors (see below), whose sum is σ = 6251010878. Its totient is φ = 1565810688.

The previous prime is 3131621627. The next prime is 3131621639. The reversal of 3131621632 is 2361261313.

It can be written as a sum of positive squares in only one way, i.e., 1637335296 + 1494286336 = 40464^2 + 38656^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3131621632.

It is not an unprimeable number, because it can be changed into a prime (3131621639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6116193 + ... + 6116704.

Almost surely, 2^3131621632 is an apocalyptic number.

3131621632 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3131621632 is a deficient number, since it is larger than the sum of its proper divisors (3119389246).

3131621632 is an equidigital number, since it uses as much as digits as its factorization.

3131621632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12232913 (or 12232899 counting only the distinct ones).

The product of its digits is 3888, while the sum is 28.

The square root of 3131621632 is about 55960.8937741348. The cubic root of 3131621632 is about 1463.0407683138.

Adding to 3131621632 its reverse (2361261313), we get a palindrome (5492882945).

The spelling of 3131621632 in words is "three billion, one hundred thirty-one million, six hundred twenty-one thousand, six hundred thirty-two".