217561996 has 6 divisors (see below), whose sum is σ = 380733500. Its totient is φ = 108780996.

The previous prime is 217561987. The next prime is 217562003. The reversal of 217561996 is 699165712.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27195246 + ... + 27195253.

Almost surely, 2^217561996 is an apocalyptic number.

It is an amenable number.

217561996 is a deficient number, since it is larger than the sum of its proper divisors (163171504).

217561996 is a wasteful number, since it uses less digits than its factorization.

217561996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54390503 (or 54390501 counting only the distinct ones).

The product of its digits is 204120, while the sum is 46.

The square root of 217561996 is about 14749.9829152443. The cubic root of 217561996 is about 601.4428202610.

The spelling of 217561996 in words is "two hundred seventeen million, five hundred sixty-one thousand, nine hundred ninety-six".