42320431 has 2 divisors, whose sum is σ = 42320432. Its totient is φ = 42320430.

The previous prime is 42320423. The next prime is 42320441. The reversal of 42320431 is 13402324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42320431 - 2³ = 42320423 is a prime.

It is a super-2 number, since 2×42320431² = 3582037760051522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42320399 and 42320408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42320401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160215 + 21160216.

It is an arithmetic number, because the mean of its divisors is an integer number (21160216).

Almost surely, 2^42320431 is an apocalyptic number.

42320431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42320431 is an equidigital number, since it uses as much as digits as its factorization.

42320431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42320431 is about 6505.4155132474. The cubic root of 42320431 is about 348.4844153321.

Adding to 42320431 its reverse (13402324), we get a palindrome (55722755).

The spelling of 42320431 in words is "forty-two million, three hundred twenty thousand, four hundred thirty-one".