191922149 has 2 divisors, whose sum is σ = 191922150. Its totient is φ = 191922148.

The previous prime is 191922139. The next prime is 191922151. The reversal of 191922149 is 941229191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170485249 + 21436900 = 13057^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 191922149 - 2¹² = 191918053 is a prime.

It is a super-2 number, since 2×191922149² = 73668222553556402, which contains 22 as substring.

Together with 191922151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191922139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95961074 + 95961075.

It is an arithmetic number, because the mean of its divisors is an integer number (95961075).

Almost surely, 2^191922149 is an apocalyptic number.

It is an amenable number.

191922149 is a deficient number, since it is larger than the sum of its proper divisors (1).

191922149 is an equidigital number, since it uses as much as digits as its factorization.

191922149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The square root of 191922149 is about 13853.5969697404. The cubic root of 191922149 is about 576.8218449630.

The spelling of 191922149 in words is "one hundred ninety-one million, nine hundred twenty-two thousand, one hundred forty-nine".