13321631 has 4 divisors (see below), whose sum is σ = 13332264. Its totient is φ = 13311000.

The previous prime is 13321619. The next prime is 13321639. The reversal of 13321631 is 13612331.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 13612331 = 881 ⋅15451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13321631 is a prime.

It is a super-2 number, since 2×13321631² = 354931705000322, 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 (13321639) 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, 3140 + ... + 6041.

It is an arithmetic number, because the mean of its divisors is an integer number (3333066).

Almost surely, 2^13321631 is an apocalyptic number.

13321631 is a deficient number, since it is larger than the sum of its proper divisors (10633).

13321631 is an equidigital number, since it uses as much as digits as its factorization.

13321631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632.

The product of its digits is 324, while the sum is 20.

The square root of 13321631 is about 3649.8809569628. The cubic root of 13321631 is about 237.0568267419.

Adding to 13321631 its reverse (13612331), we get a palindrome (26933962).

The spelling of 13321631 in words is "thirteen million, three hundred twenty-one thousand, six hundred thirty-one".