191182421 has 2 divisors, whose sum is σ = 191182422. Its totient is φ = 191182420.

The previous prime is 191182379. The next prime is 191182451. The reversal of 191182421 is 124281191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180364900 + 10817521 = 13430^2 + 3289^2 .

It is a cyclic number.

It is not a de Polignac number, because 191182421 - 2²⁶ = 124073557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191182451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95591210 + 95591211.

It is an arithmetic number, because the mean of its divisors is an integer number (95591211).

Almost surely, 2^191182421 is an apocalyptic number.

It is an amenable number.

191182421 is a deficient number, since it is larger than the sum of its proper divisors (1).

191182421 is an equidigital number, since it uses as much as digits as its factorization.

191182421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 29.

The square root of 191182421 is about 13826.8731461600. The cubic root of 191182421 is about 576.0798068512.

The spelling of 191182421 in words is "one hundred ninety-one million, one hundred eighty-two thousand, four hundred twenty-one".