13561531 has 8 divisors (see below), whose sum is σ = 14107680. Its totient is φ = 13020672.

The previous prime is 13561523. The next prime is 13561549. The reversal of 13561531 is 13516531.

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

It is a cyclic number.

It is not a de Polignac number, because 13561531 - 2³ = 13561523 is a prime.

It is a super-2 number, since 2×13561531² = 367830246127922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13561496 and 13561505.

It is not an unprimeable number, because it can be changed into a prime (13561511) 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 7 ways as a sum of consecutive naturals, for example, 4386 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (1763460).

Almost surely, 2^13561531 is an apocalyptic number.

13561531 is a deficient number, since it is larger than the sum of its proper divisors (546149).

13561531 is a wasteful number, since it uses less digits than its factorization.

13561531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645.

The product of its digits is 1350, while the sum is 25.

The square root of 13561531 is about 3682.5984033017. The cubic root of 13561531 is about 238.4713665124.

The spelling of 13561531 in words is "thirteen million, five hundred sixty-one thousand, five hundred thirty-one".