1320638631 has 8 divisors (see below), whose sum is σ = 1896301680. Its totient is φ = 812700672.

The previous prime is 1320638629. The next prime is 1320638677. The reversal of 1320638631 is 1368360231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1320638631 - 2¹ = 1320638629 is a prime.

It is a super-2 number, since 2×1320638631² = 3488172787379108322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1320638592 and 1320638601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320638611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16931226 + ... + 16931303.

It is an arithmetic number, because the mean of its divisors is an integer number (237037710).

Almost surely, 2^1320638631 is an apocalyptic number.

1320638631 is a deficient number, since it is larger than the sum of its proper divisors (575663049).

1320638631 is a wasteful number, since it uses less digits than its factorization.

1320638631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33862545.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 1320638631 is about 36340.5920562668. The cubic root of 1320638631 is about 1097.1381894134.

Adding to 1320638631 its reverse (1368360231), we get a palindrome (2688998862).

The spelling of 1320638631 in words is "one billion, three hundred twenty million, six hundred thirty-eight thousand, six hundred thirty-one".