216172157 has 2 divisors, whose sum is σ = 216172158. Its totient is φ = 216172156.

The previous prime is 216172141. The next prime is 216172169. The reversal of 216172157 is 751271612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216060601 + 111556 = 14699^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 216172157 - 2⁴ = 216172141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216174157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108086078 + 108086079.

It is an arithmetic number, because the mean of its divisors is an integer number (108086079).

Almost surely, 2^216172157 is an apocalyptic number.

It is an amenable number.

216172157 is a deficient number, since it is larger than the sum of its proper divisors (1).

216172157 is an equidigital number, since it uses as much as digits as its factorization.

216172157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 32.

The square root of 216172157 is about 14702.7941902211. The cubic root of 216172157 is about 600.1593622986.

The spelling of 216172157 in words is "two hundred sixteen million, one hundred seventy-two thousand, one hundred fifty-seven".