217040157 has 6 divisors (see below), whose sum is σ = 313502462. Its totient is φ = 144693432.

The previous prime is 217040137. The next prime is 217040189. The reversal of 217040157 is 751040712.

It can be written as a sum of positive squares in only one way, i.e., 129823236 + 87216921 = 11394^2 + 9339^2 .

It is a de Polignac number, because none of the positive numbers 2^k-217040157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217040157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217040137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12057778 + ... + 12057795.

Almost surely, 2^217040157 is an apocalyptic number.

It is an amenable number.

217040157 is a deficient number, since it is larger than the sum of its proper divisors (96462305).

217040157 is a wasteful number, since it uses less digits than its factorization.

217040157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24115579 (or 24115576 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 217040157 is about 14732.2828169975. The cubic root of 217040157 is about 600.9615664932.

Adding to 217040157 its reverse (751040712), we get a palindrome (968080869).

The spelling of 217040157 in words is "two hundred seventeen million, forty thousand, one hundred fifty-seven".