218085451 has 2 divisors, whose sum is σ = 218085452. Its totient is φ = 218085450.

The previous prime is 218085449. The next prime is 218085457. The reversal of 218085451 is 154580812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218085451 - 2¹ = 218085449 is a prime.

It is a super-2 number, since 2×218085451² = 95122527875746802, which contains 22 as substring.

Together with 218085449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (218085457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109042725 + 109042726.

It is an arithmetic number, because the mean of its divisors is an integer number (109042726).

Almost surely, 2^218085451 is an apocalyptic number.

218085451 is a deficient number, since it is larger than the sum of its proper divisors (1).

218085451 is an equidigital number, since it uses as much as digits as its factorization.

218085451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12800, while the sum is 34.

The square root of 218085451 is about 14767.7165127179. The cubic root of 218085451 is about 601.9247918393.

The spelling of 218085451 in words is "two hundred eighteen million, eighty-five thousand, four hundred fifty-one".