424221191 has 2 divisors, whose sum is σ = 424221192. Its totient is φ = 424221190.

The previous prime is 424221173. The next prime is 424221199. The reversal of 424221191 is 191122424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424221191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 424221191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424221199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212110595 + 212110596.

It is an arithmetic number, because the mean of its divisors is an integer number (212110596).

Almost surely, 2^424221191 is an apocalyptic number.

424221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

424221191 is an equidigital number, since it uses as much as digits as its factorization.

424221191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 424221191 is about 20596.6305739555. The cubic root of 424221191 is about 751.3877659644.

The spelling of 424221191 in words is "four hundred twenty-four million, two hundred twenty-one thousand, one hundred ninety-one".