1331404631 has 4 divisors (see below), whose sum is σ = 1331513232. Its totient is φ = 1331296032.

The previous prime is 1331404621. The next prime is 1331404663. The reversal of 1331404631 is 1364041331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1331404631 - 2²² = 1327210327 is a prime.

It is a super-2 number, since 2×1331404631² = 3545276582896492322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331404631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331404621) 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, 33170 + ... + 61343.

It is an arithmetic number, because the mean of its divisors is an integer number (332878308).

Almost surely, 2^1331404631 is an apocalyptic number.

1331404631 is a deficient number, since it is larger than the sum of its proper divisors (108601).

1331404631 is an equidigital number, since it uses as much as digits as its factorization.

1331404631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108600.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1331404631 is about 36488.4177650936. The cubic root of 1331404631 is about 1100.1114573013. Note that the first 3 decimals are identical.

Adding to 1331404631 its reverse (1364041331), we get a palindrome (2695445962).

The spelling of 1331404631 in words is "one billion, three hundred thirty-one million, four hundred four thousand, six hundred thirty-one".