191272663 has 2 divisors, whose sum is σ = 191272664. Its totient is φ = 191272662.

The previous prime is 191272597. The next prime is 191272673. The reversal of 191272663 is 366272191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191272663 is a prime.

It is a super-2 number, since 2×191272663² = 73170463222223138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191272673) 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, 95636331 + 95636332.

It is an arithmetic number, because the mean of its divisors is an integer number (95636332).

Almost surely, 2^191272663 is an apocalyptic number.

191272663 is a deficient number, since it is larger than the sum of its proper divisors (1).

191272663 is an equidigital number, since it uses as much as digits as its factorization.

191272663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 191272663 is about 13830.1360441610. The cubic root of 191272663 is about 576.1704330644.

The spelling of 191272663 in words is "one hundred ninety-one million, two hundred seventy-two thousand, six hundred sixty-three".