13905531 has 6 divisors (see below), whose sum is σ = 20085780. Its totient is φ = 9270348.

The previous prime is 13905527. The next prime is 13905539. The reversal of 13905531 is 13550931.

13905531 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13905531 - 2² = 13905527 is a prime.

It is a super-2 number, since 2×13905531² = 386727584783922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13905495 and 13905504.

It is not an unprimeable number, because it can be changed into a prime (13905539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772521 + ... + 772538.

It is an arithmetic number, because the mean of its divisors is an integer number (3347630).

Almost surely, 2^13905531 is an apocalyptic number.

13905531 is a deficient number, since it is larger than the sum of its proper divisors (6180249).

13905531 is a wasteful number, since it uses less digits than its factorization.

13905531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545065 (or 1545062 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 27.

The square root of 13905531 is about 3729.0120675589. The cubic root of 13905531 is about 240.4708983737.

The spelling of 13905531 in words is "thirteen million, nine hundred five thousand, five hundred thirty-one".