18550461 has 4 divisors (see below), whose sum is σ = 24733952. Its totient is φ = 12366972.

The previous prime is 18550457. The next prime is 18550507. The reversal of 18550461 is 16405581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16405581 = 3 ⋅5468527.

It is not a de Polignac number, because 18550461 - 2² = 18550457 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 (18550421) 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, 3091741 + ... + 3091746.

It is an arithmetic number, because the mean of its divisors is an integer number (6183488).

Almost surely, 2^18550461 is an apocalyptic number.

It is an amenable number.

18550461 is a deficient number, since it is larger than the sum of its proper divisors (6183491).

18550461 is an equidigital number, since it uses as much as digits as its factorization.

18550461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183490.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 18550461 is about 4307.0246110279. The cubic root of 18550461 is about 264.7188712029.

The spelling of 18550461 in words is "eighteen million, five hundred fifty thousand, four hundred sixty-one".