18513401 has 4 divisors (see below), whose sum is σ = 18696804. Its totient is φ = 18330000.

The previous prime is 18513371. The next prime is 18513409. The reversal of 18513401 is 10431581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14899600 + 3613801 = 3860^2 + 1901^2 .

It is a cyclic number.

It is not a de Polignac number, because 18513401 - 2⁶ = 18513337 is a prime.

It is a super-3 number, since 3×18513401³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18513409) 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, 91550 + ... + 91751.

It is an arithmetic number, because the mean of its divisors is an integer number (4674201).

Almost surely, 2^18513401 is an apocalyptic number.

It is an amenable number.

18513401 is a deficient number, since it is larger than the sum of its proper divisors (183403).

18513401 is a wasteful number, since it uses less digits than its factorization.

18513401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183402.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18513401 is about 4302.7201861148. The cubic root of 18513401 is about 264.5424690866.

Adding to 18513401 its reverse (10431581), we get a palindrome (28944982).

The spelling of 18513401 in words is "eighteen million, five hundred thirteen thousand, four hundred one".