191671157 has 2 divisors, whose sum is σ = 191671158. Its totient is φ = 191671156.

The previous prime is 191671147. The next prime is 191671169. The reversal of 191671157 is 751176191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190826596 + 844561 = 13814^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 191671157 - 2¹⁶ = 191605621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191671157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191671147) 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, 95835578 + 95835579.

It is an arithmetic number, because the mean of its divisors is an integer number (95835579).

Almost surely, 2^191671157 is an apocalyptic number.

It is an amenable number.

191671157 is a deficient number, since it is larger than the sum of its proper divisors (1).

191671157 is an equidigital number, since it uses as much as digits as its factorization.

191671157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 38.

The square root of 191671157 is about 13844.5352756963. The cubic root of 191671157 is about 576.5702831924.

The spelling of 191671157 in words is "one hundred ninety-one million, six hundred seventy-one thousand, one hundred fifty-seven".