218149487 has 2 divisors, whose sum is σ = 218149488. Its totient is φ = 218149486.

The previous prime is 218149483. The next prime is 218149489. The reversal of 218149487 is 784941812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218149487 - 2² = 218149483 is a prime.

Together with 218149489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218149483) 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, 109074743 + 109074744.

It is an arithmetic number, because the mean of its divisors is an integer number (109074744).

Almost surely, 2^218149487 is an apocalyptic number.

218149487 is a deficient number, since it is larger than the sum of its proper divisors (1).

218149487 is an equidigital number, since it uses as much as digits as its factorization.

218149487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 44.

The square root of 218149487 is about 14769.8844612949. The cubic root of 218149487 is about 601.9837000697.

The spelling of 218149487 in words is "two hundred eighteen million, one hundred forty-nine thousand, four hundred eighty-seven".