423973631 has 2 divisors, whose sum is σ = 423973632. Its totient is φ = 423973630.

The previous prime is 423973603. The next prime is 423973663. The reversal of 423973631 is 136379324.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423973631 is a prime.

It is a super-2 number, since 2×423973631² = 359507279566648322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423973601) 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, 211986815 + 211986816.

It is an arithmetic number, because the mean of its divisors is an integer number (211986816).

Almost surely, 2^423973631 is an apocalyptic number.

423973631 is a deficient number, since it is larger than the sum of its proper divisors (1).

423973631 is an equidigital number, since it uses as much as digits as its factorization.

423973631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

The square root of 423973631 is about 20590.6199760959. The cubic root of 423973631 is about 751.2415767007.

The spelling of 423973631 in words is "four hundred twenty-three million, nine hundred seventy-three thousand, six hundred thirty-one".