423511391 has 2 divisors, whose sum is σ = 423511392. Its totient is φ = 423511390.

The previous prime is 423511369. The next prime is 423511441. The reversal of 423511391 is 193115324.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423511391 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423511321) 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, 211755695 + 211755696.

It is an arithmetic number, because the mean of its divisors is an integer number (211755696).

Almost surely, 2^423511391 is an apocalyptic number.

423511391 is a deficient number, since it is larger than the sum of its proper divisors (1).

423511391 is an equidigital number, since it uses as much as digits as its factorization.

423511391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 423511391 is about 20579.3923865599. The cubic root of 423511391 is about 750.9684620885.

The spelling of 423511391 in words is "four hundred twenty-three million, five hundred eleven thousand, three hundred ninety-one".