18604961 has 4 divisors (see below), whose sum is σ = 18956052. Its totient is φ = 18253872.

The previous prime is 18604931. The next prime is 18604967. The reversal of 18604961 is 16940681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16940681 = 79 ⋅214439.

It can be written as a sum of positive squares in 2 ways, for example, as 10764961 + 7840000 = 3281^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 18604961 - 2⁶ = 18604897 is a prime.

It is a super-2 number, since 2×18604961² = 692289147623042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18604967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175466 + ... + 175571.

It is an arithmetic number, because the mean of its divisors is an integer number (4739013).

Almost surely, 2^18604961 is an apocalyptic number.

It is an amenable number.

18604961 is a deficient number, since it is larger than the sum of its proper divisors (351091).

18604961 is an equidigital number, since it uses as much as digits as its factorization.

18604961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351090.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18604961 is about 4313.3468443889. The cubic root of 18604961 is about 264.9778597855.

The spelling of 18604961 in words is "eighteen million, six hundred four thousand, nine hundred sixty-one".