13545631 has 4 divisors (see below), whose sum is σ = 14777064. Its totient is φ = 12314200.

The previous prime is 13545629. The next prime is 13545647. The reversal of 13545631 is 13654531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13654531 = 11 ⋅1241321.

It is a cyclic number.

It is not a de Polignac number, because 13545631 - 2¹ = 13545629 is a prime.

It is a super-2 number, since 2×13545631² = 366968238376322, 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 13545631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13545691) 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, 615700 + ... + 615721.

It is an arithmetic number, because the mean of its divisors is an integer number (3694266).

Almost surely, 2^13545631 is an apocalyptic number.

13545631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13545631 is a deficient number, since it is larger than the sum of its proper divisors (1231433).

13545631 is a wasteful number, since it uses less digits than its factorization.

13545631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231432.

The product of its digits is 5400, while the sum is 28.

The square root of 13545631 is about 3680.4389683841. The cubic root of 13545631 is about 238.3781327536.

Subtracting 13545631 from its reverse (13654531), we obtain a square (108900 = 330²).

The spelling of 13545631 in words is "thirteen million, five hundred forty-five thousand, six hundred thirty-one".