13431550 has 24 divisors (see below), whose sum is σ = 27254952. Its totient is φ = 4884000.

The previous prime is 13431541. The next prime is 13431569. The reversal of 13431550 is 5513431.

It is a happy number.

It is a hoax number, since the sum of its digits (22) 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 (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11661 + ... + 12760.

It is an arithmetic number, because the mean of its divisors is an integer number (1135623).

Almost surely, 2^13431550 is an apocalyptic number.

13431550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13431550 is an abundant number, since it is smaller than the sum of its proper divisors (13823402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13431550 is a wasteful number, since it uses less digits than its factorization.

13431550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24444 (or 24439 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 13431550 is about 3664.9079115307. The cubic root of 13431550 is about 237.7070401440.

Adding to 13431550 its reverse (5513431), we get a palindrome (18944981).

It can be divided in two parts, 134 and 31550, that added together give a square (31684 = 178²).

The spelling of 13431550 in words is "thirteen million, four hundred thirty-one thousand, five hundred fifty".