18102061 has 4 divisors (see below), whose sum is σ = 18726300. Its totient is φ = 17477824.

The previous prime is 18102053. The next prime is 18102083. The reversal of 18102061 is 16020181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16020181 = 307 ⋅52183.

It can be written as a sum of positive squares in 2 ways, for example, as 3132900 + 14969161 = 1770^2 + 3869^2 .

It is a cyclic number.

It is not a de Polignac number, because 18102061 - 2³ = 18102053 is a prime.

It is a super-2 number, since 2×18102061² = 655369224895442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18102761) 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, 312076 + ... + 312133.

It is an arithmetic number, because the mean of its divisors is an integer number (4681575).

Almost surely, 2^18102061 is an apocalyptic number.

It is an amenable number.

18102061 is a deficient number, since it is larger than the sum of its proper divisors (624239).

18102061 is an equidigital number, since it uses as much as digits as its factorization.

18102061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624238.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 18102061 is about 4254.6516896216. The cubic root of 18102061 is about 262.5685311621.

The spelling of 18102061 in words is "eighteen million, one hundred two thousand, sixty-one".