13530531 has 16 divisors (see below), whose sum is σ = 20772864. Its totient is φ = 7673664.

The previous prime is 13530523. The next prime is 13530557. The reversal of 13530531 is 13503531.

It is a happy number.

It is not a de Polignac number, because 13530531 - 2³ = 13530523 is a prime.

It is a super-2 number, since 2×13530531² = 366150538283922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 13530498 and 13530507.

It is not an unprimeable number, because it can be changed into a prime (13530131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526 + ... + 5228.

It is an arithmetic number, because the mean of its divisors is an integer number (1298304).

Almost surely, 2^13530531 is an apocalyptic number.

13530531 is a deficient number, since it is larger than the sum of its proper divisors (7242333).

13530531 is a wasteful number, since it uses less digits than its factorization.

13530531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850.

The product of its (nonzero) digits is 675, while the sum is 21.

The square root of 13530531 is about 3678.3870106339. The cubic root of 13530531 is about 238.2895224321.

Subtracting from 13530531 its reverse (13503531), we obtain a cube (27000 = 30³).

The spelling of 13530531 in words is "thirteen million, five hundred thirty thousand, five hundred thirty-one".