18491201 has 2 divisors, whose sum is σ = 18491202. Its totient is φ = 18491200.

The previous prime is 18491177. The next prime is 18491203. The reversal of 18491201 is 10219481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 207025 = 4276^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 18491201 - 2¹⁰ = 18490177 is a prime.

It is a Sophie Germain prime.

Together with 18491203, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18491203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245600 + 9245601.

It is an arithmetic number, because the mean of its divisors is an integer number (9245601).

Almost surely, 2^18491201 is an apocalyptic number.

It is an amenable number.

18491201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18491201 is an equidigital number, since it uses as much as digits as its factorization.

18491201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18491201 is about 4300.1396488951. The cubic root of 18491201 is about 264.4366864013.

The spelling of 18491201 in words is "eighteen million, four hundred ninety-one thousand, two hundred one".