1331479631 has 4 divisors (see below), whose sum is σ = 1349719152. Its totient is φ = 1313240112.

The previous prime is 1331479613. The next prime is 1331479657. The reversal of 1331479631 is 1369741331.

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

It is a cyclic number.

It is not a de Polignac number, because 1331479631 - 2²² = 1327285327 is a prime.

It is a super-2 number, since 2×1331479631² = 3545676015535792322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331479231) 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, 9119651 + ... + 9119796.

It is an arithmetic number, because the mean of its divisors is an integer number (337429788).

Almost surely, 2^1331479631 is an apocalyptic number.

1331479631 is a deficient number, since it is larger than the sum of its proper divisors (18239521).

1331479631 is an equidigital number, since it uses as much as digits as its factorization.

1331479631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18239520.

The product of its digits is 40824, while the sum is 38.

The square root of 1331479631 is about 36489.4454739997. The cubic root of 1331479631 is about 1100.1321138841.

The spelling of 1331479631 in words is "one billion, three hundred thirty-one million, four hundred seventy-nine thousand, six hundred thirty-one".