42431999 has 2 divisors, whose sum is σ = 42432000. Its totient is φ = 42431998.

The previous prime is 42431981. The next prime is 42432001. The reversal of 42431999 is 99913424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42431999 - 2¹⁶ = 42366463 is a prime.

Together with 42432001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42431969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21215999 + 21216000.

It is an arithmetic number, because the mean of its divisors is an integer number (21216000).

Almost surely, 2^42431999 is an apocalyptic number.

42431999 is a deficient number, since it is larger than the sum of its proper divisors (1).

42431999 is an equidigital number, since it uses as much as digits as its factorization.

42431999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 42431999 is about 6513.9848787052. The cubic root of 42431999 is about 348.7903793981.

It can be divided in two parts, 424 and 31999, that added together give a palindrome (32423).

The spelling of 42431999 in words is "forty-two million, four hundred thirty-one thousand, nine hundred ninety-nine".