18534977 has 2 divisors, whose sum is σ = 18534978. Its totient is φ = 18534976.

The previous prime is 18534961. The next prime is 18534991. The reversal of 18534977 is 77943581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 633616 = 4231^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 18534977 - 2⁴ = 18534961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18534377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267488 + 9267489.

It is an arithmetic number, because the mean of its divisors is an integer number (9267489).

Almost surely, 2^18534977 is an apocalyptic number.

It is an amenable number.

18534977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18534977 is an equidigital number, since it uses as much as digits as its factorization.

18534977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 18534977 is about 4305.2267071549. The cubic root of 18534977 is about 264.6451974187.

The spelling of 18534977 in words is "eighteen million, five hundred thirty-four thousand, nine hundred seventy-seven".