218073613 has 2 divisors, whose sum is σ = 218073614. Its totient is φ = 218073612.

The previous prime is 218073607. The next prime is 218073631. The reversal of 218073613 is 316370812.

Together with next prime (218073631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216590089 + 1483524 = 14717^2 + 1218^2 .

It is a cyclic number.

It is not a de Polignac number, because 218073613 - 2²¹ = 215976461 is a prime.

It is a super-2 number, since 2×218073613² = 95112201373747538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218073643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109036806 + 109036807.

It is an arithmetic number, because the mean of its divisors is an integer number (109036807).

Almost surely, 2^218073613 is an apocalyptic number.

It is an amenable number.

218073613 is a deficient number, since it is larger than the sum of its proper divisors (1).

218073613 is an equidigital number, since it uses as much as digits as its factorization.

218073613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 218073613 is about 14767.3157005598. The cubic root of 218073613 is about 601.9139005204.

The spelling of 218073613 in words is "two hundred eighteen million, seventy-three thousand, six hundred thirteen".