13557997 has 4 divisors (see below), whose sum is σ = 13633920. Its totient is φ = 13482076.

The previous prime is 13557991. The next prime is 13558009. The reversal of 13557997 is 79975531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13557997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13557991) 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, 37693 + ... + 38050.

It is an arithmetic number, because the mean of its divisors is an integer number (3408480).

Almost surely, 2^13557997 is an apocalyptic number.

It is an amenable number.

13557997 is a deficient number, since it is larger than the sum of its proper divisors (75923).

13557997 is an equidigital number, since it uses as much as digits as its factorization.

13557997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75922.

The product of its digits is 297675, while the sum is 46.

The square root of 13557997 is about 3682.1185477928. The cubic root of 13557997 is about 238.4506502913.

The spelling of 13557997 in words is "thirteen million, five hundred fifty-seven thousand, nine hundred ninety-seven".