424311991 has 2 divisors, whose sum is σ = 424311992. Its totient is φ = 424311990.

The previous prime is 424311941. The next prime is 424312033. The reversal of 424311991 is 199113424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 424311991 - 2⁷ = 424311863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424311931) 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, 212155995 + 212155996.

It is an arithmetic number, because the mean of its divisors is an integer number (212155996).

Almost surely, 2^424311991 is an apocalyptic number.

424311991 is a deficient number, since it is larger than the sum of its proper divisors (1).

424311991 is an equidigital number, since it uses as much as digits as its factorization.

424311991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 424311991 is about 20598.8347000504. The cubic root of 424311991 is about 751.4413709732.

The spelling of 424311991 in words is "four hundred twenty-four million, three hundred eleven thousand, nine hundred ninety-one".