191431841 has 2 divisors, whose sum is σ = 191431842. Its totient is φ = 191431840.

The previous prime is 191431837. The next prime is 191431909. The reversal of 191431841 is 148134191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177955600 + 13476241 = 13340^2 + 3671^2 .

It is a cyclic number.

It is not a de Polignac number, because 191431841 - 2² = 191431837 is a prime.

It is a super-2 number, since 2×191431841² = 73292299497298562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191431798 and 191431807.

It is not a weakly prime, because it can be changed into another prime (191431811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95715920 + 95715921.

It is an arithmetic number, because the mean of its divisors is an integer number (95715921).

Almost surely, 2^191431841 is an apocalyptic number.

It is an amenable number.

191431841 is a deficient number, since it is larger than the sum of its proper divisors (1).

191431841 is an equidigital number, since it uses as much as digits as its factorization.

191431841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 191431841 is about 13835.8895991548. The cubic root of 191431841 is about 576.3302193192.

The spelling of 191431841 in words is "one hundred ninety-one million, four hundred thirty-one thousand, eight hundred forty-one".