18900971 has 2 divisors, whose sum is σ = 18900972. Its totient is φ = 18900970.

The previous prime is 18900967. The next prime is 18900983. The reversal of 18900971 is 17900981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18900971 - 2² = 18900967 is a prime.

It is not a weakly prime, because it can be changed into another prime (18900961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450485 + 9450486.

It is an arithmetic number, because the mean of its divisors is an integer number (9450486).

Almost surely, 2^18900971 is an apocalyptic number.

18900971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18900971 is an equidigital number, since it uses as much as digits as its factorization.

18900971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 18900971 is about 4347.5246980322. The cubic root of 18900971 is about 266.3757621102.

The spelling of 18900971 in words is "eighteen million, nine hundred thousand, nine hundred seventy-one".