13555431 has 20 divisors (see below), whose sum is σ = 20801352. Its totient is φ = 8790768.

The previous prime is 13555429. The next prime is 13555433. The reversal of 13555431 is 13455531.

It is an interprime number because it is at equal distance from previous prime (13555429) and next prime (13555433).

It is not a de Polignac number, because 13555431 - 2¹ = 13555429 is a prime.

It is a super-2 number, since 2×13555431² = 367499419191522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 13555395 and 13555404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555433) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 736 + ... + 5258.

Almost surely, 2^13555431 is an apocalyptic number.

13555431 is a deficient number, since it is larger than the sum of its proper divisors (7245921).

13555431 is an equidigital number, since it uses as much as digits as its factorization.

13555431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572 (or 4563 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 13555431 is about 3681.7700905950. The cubic root of 13555431 is about 238.4356062064.

It can be divided in two parts, 1355 and 5431, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 13555431 in words is "thirteen million, five hundred fifty-five thousand, four hundred thirty-one".