13573018 has 4 divisors (see below), whose sum is σ = 20359530. Its totient is φ = 6786508.

The previous prime is 13573003. The next prime is 13573019. The reversal of 13573018 is 81037531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81037531 = 223 ⋅363397.

It can be written as a sum of positive squares in only one way, i.e., 6901129 + 6671889 = 2627^2 + 2583^2 .

It is not an unprimeable number, because it can be changed into a prime (13573019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3393253 + ... + 3393256.

Almost surely, 2^13573018 is an apocalyptic number.

13573018 is a deficient number, since it is larger than the sum of its proper divisors (6786512).

13573018 is an equidigital number, since it uses as much as digits as its factorization.

13573018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786511.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 13573018 is about 3684.1577056364. The cubic root of 13573018 is about 238.5386781732.

It can be divided in two parts, 135 and 73018, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 13573018 in words is "thirteen million, five hundred seventy-three thousand, eighteen".