18267961 has 2 divisors, whose sum is σ = 18267962. Its totient is φ = 18267960.

The previous prime is 18267943. The next prime is 18268009. The reversal of 18267961 is 16976281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 962361 = 4160^2 + 981^2 .

It is a cyclic number.

It is not a de Polignac number, because 18267961 - 2⁷ = 18267833 is a prime.

It is not a weakly prime, because it can be changed into another prime (18267901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9133980 + 9133981.

It is an arithmetic number, because the mean of its divisors is an integer number (9133981).

Almost surely, 2^18267961 is an apocalyptic number.

It is an amenable number.

18267961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18267961 is an equidigital number, since it uses as much as digits as its factorization.

18267961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 18267961 is about 4274.1035317362. The cubic root of 18267961 is about 263.3682139699.

The spelling of 18267961 in words is "eighteen million, two hundred sixty-seven thousand, nine hundred sixty-one".