191855941 has 2 divisors, whose sum is σ = 191855942. Its totient is φ = 191855940.

The previous prime is 191855929. The next prime is 191855947. The reversal of 191855941 is 149558191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116964225 + 74891716 = 10815^2 + 8654^2 .

It is a cyclic number.

It is not a de Polignac number, because 191855941 - 2¹⁵ = 191823173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191855947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95927970 + 95927971.

It is an arithmetic number, because the mean of its divisors is an integer number (95927971).

Almost surely, 2^191855941 is an apocalyptic number.

It is an amenable number.

191855941 is a deficient number, since it is larger than the sum of its proper divisors (1).

191855941 is an equidigital number, since it uses as much as digits as its factorization.

191855941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 43.

The square root of 191855941 is about 13851.2072037061. The cubic root of 191855941 is about 576.7555079729.

The spelling of 191855941 in words is "one hundred ninety-one million, eight hundred fifty-five thousand, nine hundred forty-one".