157188191 has 2 divisors, whose sum is σ = 157188192. Its totient is φ = 157188190.

The previous prime is 157188181. The next prime is 157188203. The reversal of 157188191 is 191881751.

157188191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (191881751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157188191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157188181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78594095 + 78594096.

It is an arithmetic number, because the mean of its divisors is an integer number (78594096).

Almost surely, 2^157188191 is an apocalyptic number.

157188191 is a deficient number, since it is larger than the sum of its proper divisors (1).

157188191 is an equidigital number, since it uses as much as digits as its factorization.

157188191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 41.

The square root of 157188191 is about 12537.4714755408. The cubic root of 157188191 is about 539.6845333909.

The spelling of 157188191 in words is "one hundred fifty-seven million, one hundred eighty-eight thousand, one hundred ninety-one".