13557231 has 6 divisors (see below), whose sum is σ = 19582680. Its totient is φ = 9038148.

The previous prime is 13557217. The next prime is 13557251. The reversal of 13557231 is 13275531.

It is not a de Polignac number, because 13557231 - 2¹¹ = 13555183 is a prime.

It is a super-2 number, since 2×13557231² = 367597024774722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13557195 and 13557204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13557251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 753171 + ... + 753188.

It is an arithmetic number, because the mean of its divisors is an integer number (3263780).

Almost surely, 2^13557231 is an apocalyptic number.

13557231 is a deficient number, since it is larger than the sum of its proper divisors (6025449).

13557231 is a wasteful number, since it uses less digits than its factorization.

13557231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506365 (or 1506362 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 13557231 is about 3682.0145301180. The cubic root of 13557231 is about 238.4461595434.

The spelling of 13557231 in words is "thirteen million, five hundred fifty-seven thousand, two hundred thirty-one".