1321133631 has 32 divisors (see below), whose sum is σ = 1982880000. Its totient is φ = 777484800.

The previous prime is 1321133623. The next prime is 1321133641. The reversal of 1321133631 is 1363311231.

It is not a de Polignac number, because 1321133631 - 2³ = 1321133623 is a prime.

It is a super-2 number, since 2×1321133631² = 3490788141918488322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321133621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91120 + ... + 104618.

It is an arithmetic number, because the mean of its divisors is an integer number (61965000).

Almost surely, 2^1321133631 is an apocalyptic number.

1321133631 is a deficient number, since it is larger than the sum of its proper divisors (661746369).

1321133631 is a wasteful number, since it uses less digits than its factorization.

1321133631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13639.

The product of its digits is 972, while the sum is 24.

The square root of 1321133631 is about 36347.4019841859. The cubic root of 1321133631 is about 1097.2752482455.

Adding to 1321133631 its reverse (1363311231), we get a palindrome (2684444862).

The spelling of 1321133631 in words is "one billion, three hundred twenty-one million, one hundred thirty-three thousand, six hundred thirty-one".