4197942157 has 2 divisors, whose sum is σ = 4197942158. Its totient is φ = 4197942156.

The previous prime is 4197942131. The next prime is 4197942169. The reversal of 4197942157 is 7512497914.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2415329316 + 1782612841 = 49146^2 + 42221^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4197942157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4197942157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4197942257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2098971078 + 2098971079.

It is an arithmetic number, because the mean of its divisors is an integer number (2098971079).

Almost surely, 2^4197942157 is an apocalyptic number.

It is an amenable number.

4197942157 is a deficient number, since it is larger than the sum of its proper divisors (1).

4197942157 is an equidigital number, since it uses as much as digits as its factorization.

4197942157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 4197942157 is about 64791.5284354367. The cubic root of 4197942157 is about 1613.1650964017.

The spelling of 4197942157 in words is "four billion, one hundred ninety-seven million, nine hundred forty-two thousand, one hundred fifty-seven".