194688157 has 2 divisors, whose sum is σ = 194688158. Its totient is φ = 194688156.

The previous prime is 194688127. The next prime is 194688181. The reversal of 194688157 is 751886491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105083001 + 89605156 = 10251^2 + 9466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194688157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194688157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194688127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97344078 + 97344079.

It is an arithmetic number, because the mean of its divisors is an integer number (97344079).

Almost surely, 2^194688157 is an apocalyptic number.

It is an amenable number.

194688157 is a deficient number, since it is larger than the sum of its proper divisors (1).

194688157 is an equidigital number, since it uses as much as digits as its factorization.

194688157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 194688157 is about 13953.0698056019. The cubic root of 194688157 is about 579.5797163332.

The spelling of 194688157 in words is "one hundred ninety-four million, six hundred eighty-eight thousand, one hundred fifty-seven".