218494402531 has 2 divisors, whose sum is σ = 218494402532. Its totient is φ = 218494402530.

The previous prime is 218494402517. The next prime is 218494402579. The reversal of 218494402531 is 135204494812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218494402531 - 2⁹ = 218494402019 is a prime.

It is a super-2 number, since 2×218494402531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218494402031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109247201265 + 109247201266.

It is an arithmetic number, because the mean of its divisors is an integer number (109247201266).

Almost surely, 2^218494402531 is an apocalyptic number.

218494402531 is a deficient number, since it is larger than the sum of its proper divisors (1).

218494402531 is an equidigital number, since it uses as much as digits as its factorization.

218494402531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 218494402531 in words is "two hundred eighteen billion, four hundred ninety-four million, four hundred two thousand, five hundred thirty-one".