18550969 has 2 divisors, whose sum is σ = 18550970. Its totient is φ = 18550968.

The previous prime is 18550937. The next prime is 18550993. The reversal of 18550969 is 96905581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 164025 = 4288^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 18550969 - 2⁵ = 18550937 is a prime.

It is a super-2 number, since 2×18550969² = 688276901677922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18550999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9275484 + 9275485.

It is an arithmetic number, because the mean of its divisors is an integer number (9275485).

Almost surely, 2^18550969 is an apocalyptic number.

It is an amenable number.

18550969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18550969 is an equidigital number, since it uses as much as digits as its factorization.

18550969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 18550969 is about 4307.0835840508. The cubic root of 18550969 is about 264.7212876021.

The spelling of 18550969 in words is "eighteen million, five hundred fifty thousand, nine hundred sixty-nine".