13997551 has 2 divisors, whose sum is σ = 13997552. Its totient is φ = 13997550.

The previous prime is 13997539. The next prime is 13997561. The reversal of 13997551 is 15579931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13997551 - 2⁵ = 13997519 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13997561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6998775 + 6998776.

It is an arithmetic number, because the mean of its divisors is an integer number (6998776).

Almost surely, 2^13997551 is an apocalyptic number.

13997551 is a deficient number, since it is larger than the sum of its proper divisors (1).

13997551 is an equidigital number, since it uses as much as digits as its factorization.

13997551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42525, while the sum is 40.

The square root of 13997551 is about 3741.3301110701. The cubic root of 13997551 is about 241.0001721732. Note that the first 3 decimals are identical.

The spelling of 13997551 in words is "thirteen million, nine hundred ninety-seven thousand, five hundred fifty-one".