42425531 has 2 divisors, whose sum is σ = 42425532. Its totient is φ = 42425530.

The previous prime is 42425519. The next prime is 42425587. The reversal of 42425531 is 13552424.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42425531 is a prime.

It is a super-2 number, since 2×42425531² = 3599851361263922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42425531.

It is not a weakly prime, because it can be changed into another prime (42427531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21212765 + 21212766.

It is an arithmetic number, because the mean of its divisors is an integer number (21212766).

Almost surely, 2^42425531 is an apocalyptic number.

42425531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42425531 is an equidigital number, since it uses as much as digits as its factorization.

42425531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 26.

The square root of 42425531 is about 6513.4883894884. The cubic root of 42425531 is about 348.7726562107.

Adding to 42425531 its reverse (13552424), we get a palindrome (55977955).

The spelling of 42425531 in words is "forty-two million, four hundred twenty-five thousand, five hundred thirty-one".