18050551 has 4 divisors (see below), whose sum is σ = 19000600. Its totient is φ = 17100504.

The previous prime is 18050521. The next prime is 18050563. The reversal of 18050551 is 15505081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15505081 = 313 ⋅49537.

It is a cyclic number.

It is not a de Polignac number, because 18050551 - 2²³ = 9661943 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 (18050521) 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, 474996 + ... + 475033.

It is an arithmetic number, because the mean of its divisors is an integer number (4750150).

Almost surely, 2^18050551 is an apocalyptic number.

18050551 is a deficient number, since it is larger than the sum of its proper divisors (950049).

18050551 is an equidigital number, since it uses as much as digits as its factorization.

18050551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950048.

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 18050551 is about 4248.5940027261. The cubic root of 18050551 is about 262.3192454799.

The spelling of 18050551 in words is "eighteen million, fifty thousand, five hundred fifty-one".