18275261 has 2 divisors, whose sum is σ = 18275262. Its totient is φ = 18275260.

The previous prime is 18275251. The next prime is 18275263. The reversal of 18275261 is 16257281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 2869636 = 3925^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 18275261 - 2⁶ = 18275197 is a prime.

Together with 18275263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18275263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9137630 + 9137631.

It is an arithmetic number, because the mean of its divisors is an integer number (9137631).

Almost surely, 2^18275261 is an apocalyptic number.

It is an amenable number.

18275261 is a deficient number, since it is larger than the sum of its proper divisors (1).

18275261 is an equidigital number, since it uses as much as digits as its factorization.

18275261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 18275261 is about 4274.9574266886. The cubic root of 18275261 is about 263.4032905342.

The spelling of 18275261 in words is "eighteen million, two hundred seventy-five thousand, two hundred sixty-one".