18061247 has 4 divisors (see below), whose sum is σ = 18481320. Its totient is φ = 17641176.

The previous prime is 18061237. The next prime is 18061249. The reversal of 18061247 is 74216081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74216081 = 1607 ⋅46183.

It is a cyclic number.

It is not a de Polignac number, because 18061247 - 2¹⁰ = 18060223 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 (18061249) 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, 209972 + ... + 210057.

It is an arithmetic number, because the mean of its divisors is an integer number (4620330).

Almost surely, 2^18061247 is an apocalyptic number.

18061247 is a deficient number, since it is larger than the sum of its proper divisors (420073).

18061247 is an equidigital number, since it uses as much as digits as its factorization.

18061247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420072.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18061247 is about 4249.8525856787. The cubic root of 18061247 is about 262.3710483794.

The spelling of 18061247 in words is "eighteen million, sixty-one thousand, two hundred forty-seven".