216571157 has 4 divisors (see below), whose sum is σ = 236259456. Its totient is φ = 196882860.

The previous prime is 216571129. The next prime is 216571171. The reversal of 216571157 is 751175612.

216571157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216571157 - 2¹⁴ = 216554773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216571057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9844133 + ... + 9844154.

It is an arithmetic number, because the mean of its divisors is an integer number (59064864).

Almost surely, 2^216571157 is an apocalyptic number.

It is an amenable number.

216571157 is a deficient number, since it is larger than the sum of its proper divisors (19688299).

216571157 is a wasteful number, since it uses less digits than its factorization.

216571157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19688298.

The product of its digits is 14700, while the sum is 35.

The square root of 216571157 is about 14716.3567842044. The cubic root of 216571157 is about 600.5283836221.

The spelling of 216571157 in words is "two hundred sixteen million, five hundred seventy-one thousand, one hundred fifty-seven".