13561631 has 4 divisors (see below), whose sum is σ = 14359392. Its totient is φ = 12763872.

The previous prime is 13561621. The next prime is 13561657. The reversal of 13561631 is 13616531.

13561631 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13616531 = 163 ⋅83537.

It is not a de Polignac number, because 13561631 - 2⁶ = 13561567 is a prime.

It is a super-2 number, since 2×13561631² = 367835670760322, 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 13561631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13561621) 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, 398855 + ... + 398888.

It is an arithmetic number, because the mean of its divisors is an integer number (3589848).

Almost surely, 2^13561631 is an apocalyptic number.

13561631 is a deficient number, since it is larger than the sum of its proper divisors (797761).

13561631 is an equidigital number, since it uses as much as digits as its factorization.

13561631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797760.

The product of its digits is 1620, while the sum is 26.

The square root of 13561631 is about 3682.6119806463. The cubic root of 13561631 is about 238.4719526576.

The spelling of 13561631 in words is "thirteen million, five hundred sixty-one thousand, six hundred thirty-one".