18630971 has 2 divisors, whose sum is σ = 18630972. Its totient is φ = 18630970.

The previous prime is 18630959. The next prime is 18630973. The reversal of 18630971 is 17903681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18630971 - 2¹⁴ = 18614587 is a prime.

It is a super-2 number, since 2×18630971² = 694226160805682, which contains 22 as substring.

Together with 18630973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18630973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9315485 + 9315486.

It is an arithmetic number, because the mean of its divisors is an integer number (9315486).

Almost surely, 2^18630971 is an apocalyptic number.

18630971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18630971 is an equidigital number, since it uses as much as digits as its factorization.

18630971 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 18630971 is about 4316.3608514581. The cubic root of 18630971 is about 265.1012832259.

The spelling of 18630971 in words is "eighteen million, six hundred thirty thousand, nine hundred seventy-one".