157982197 has 2 divisors, whose sum is σ = 157982198. Its totient is φ = 157982196.

The previous prime is 157982191. The next prime is 157982219. The reversal of 157982197 is 791289751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 77841 = 12566^2 + 279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157982197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157982197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157982191) 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 as a sum of consecutive naturals, namely, 78991098 + 78991099.

It is an arithmetic number, because the mean of its divisors is an integer number (78991099).

Almost surely, 2^157982197 is an apocalyptic number.

It is an amenable number.

157982197 is a deficient number, since it is larger than the sum of its proper divisors (1).

157982197 is an equidigital number, since it uses as much as digits as its factorization.

157982197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 49.

The square root of 157982197 is about 12569.0969047104. The cubic root of 157982197 is about 540.5917119268.

The spelling of 157982197 in words is "one hundred fifty-seven million, nine hundred eighty-two thousand, one hundred ninety-seven".