218191056 has 40 divisors (see below), whose sum is σ = 596818944. Its totient is φ = 68451840.

The previous prime is 218191049. The next prime is 218191063. The reversal of 218191056 is 650191812.

It is an interprime number because it is at equal distance from previous prime (218191049) and next prime (218191063).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132880 + ... + 134511.

Almost surely, 2^218191056 is an apocalyptic number.

It is an amenable number.

218191056 is an abundant number, since it is smaller than the sum of its proper divisors (378627888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218191056 is a wasteful number, since it uses less digits than its factorization.

218191056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267419 (or 267413 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 218191056 is about 14771.2916158337. The cubic root of 218191056 is about 602.0219342052.

The spelling of 218191056 in words is "two hundred eighteen million, one hundred ninety-one thousand, fifty-six".