18037961 has 2 divisors, whose sum is σ = 18037962. Its totient is φ = 18037960.

The previous prime is 18037951. The next prime is 18038021. The reversal of 18037961 is 16973081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17272336 + 765625 = 4156^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 18037961 - 2¹⁰ = 18036937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18037931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9018980 + 9018981.

It is an arithmetic number, because the mean of its divisors is an integer number (9018981).

Almost surely, 2^18037961 is an apocalyptic number.

It is an amenable number.

18037961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18037961 is an equidigital number, since it uses as much as digits as its factorization.

18037961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18037961 is about 4247.1120776358. The cubic root of 18037961 is about 262.2582433266.

The spelling of 18037961 in words is "eighteen million, thirty-seven thousand, nine hundred sixty-one".