217682157 has 48 divisors (see below), whose sum is σ = 372183552. Its totient is φ = 111898080.

The previous prime is 217682147. The next prime is 217682197. The reversal of 217682157 is 751286712.

It is not a de Polignac number, because 217682157 - 2⁸ = 217681901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217682147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165898 + ... + 167204.

It is an arithmetic number, because the mean of its divisors is an integer number (7753824).

Almost surely, 2^217682157 is an apocalyptic number.

It is an amenable number.

217682157 is a deficient number, since it is larger than the sum of its proper divisors (154501395).

217682157 is a wasteful number, since it uses less digits than its factorization.

217682157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438 (or 1431 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 217682157 is about 14754.0556119326. The cubic root of 217682157 is about 601.5535268965.

The spelling of 217682157 in words is "two hundred seventeen million, six hundred eighty-two thousand, one hundred fifty-seven".