191427563 has 2 divisors, whose sum is σ = 191427564. Its totient is φ = 191427562.

The previous prime is 191427559. The next prime is 191427581. The reversal of 191427563 is 365724191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191427563 - 2² = 191427559 is a prime.

It is a super-2 number, since 2×191427563² = 73289023752237938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191427553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95713781 + 95713782.

It is an arithmetic number, because the mean of its divisors is an integer number (95713782).

Almost surely, 2^191427563 is an apocalyptic number.

191427563 is a deficient number, since it is larger than the sum of its proper divisors (1).

191427563 is an equidigital number, since it uses as much as digits as its factorization.

191427563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 191427563 is about 13835.7350003533. The cubic root of 191427563 is about 576.3259261305.

The spelling of 191427563 in words is "one hundred ninety-one million, four hundred twenty-seven thousand, five hundred sixty-three".