191431963 has 2 divisors, whose sum is σ = 191431964. Its totient is φ = 191431962.

The previous prime is 191431909. The next prime is 191431979. The reversal of 191431963 is 369134191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191431963 - 2²¹ = 189334811 is a prime.

It is a super-3 number, since 3×191431963³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (191432963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95715981 + 95715982.

It is an arithmetic number, because the mean of its divisors is an integer number (95715982).

Almost surely, 2^191431963 is an apocalyptic number.

191431963 is a deficient number, since it is larger than the sum of its proper divisors (1).

191431963 is an equidigital number, since it uses as much as digits as its factorization.

191431963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 191431963 is about 13835.8940079779. The cubic root of 191431963 is about 576.3303417515.

The spelling of 191431963 in words is "one hundred ninety-one million, four hundred thirty-one thousand, nine hundred sixty-three".