13431556 has 24 divisors (see below), whose sum is σ = 25544960. Its totient is φ = 6156000.

The previous prime is 13431541. The next prime is 13431569. The reversal of 13431556 is 65513431.

It is a super-2 number, since 2×13431556² = 360813393162272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495 + ... + 5206.

Almost surely, 2^13431556 is an apocalyptic number.

It is an amenable number.

13431556 is a deficient number, since it is larger than the sum of its proper divisors (12113404).

13431556 is a wasteful number, since it uses less digits than its factorization.

13431556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5755 (or 5753 counting only the distinct ones).

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

The square root of 13431556 is about 3664.9087301050. The cubic root of 13431556 is about 237.7070755393.

Adding to 13431556 its reverse (65513431), we get a palindrome (78944987).

The spelling of 13431556 in words is "thirteen million, four hundred thirty-one thousand, five hundred fifty-six".