42531539 has 2 divisors, whose sum is σ = 42531540. Its totient is φ = 42531538.

The previous prime is 42531527. The next prime is 42531547. The reversal of 42531539 is 93513524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42531539 - 2⁴ = 42531523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42531509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21265769 + 21265770.

It is an arithmetic number, because the mean of its divisors is an integer number (21265770).

Almost surely, 2^42531539 is an apocalyptic number.

42531539 is a deficient number, since it is larger than the sum of its proper divisors (1).

42531539 is an equidigital number, since it uses as much as digits as its factorization.

42531539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 42531539 is about 6521.6208874788. The cubic root of 42531539 is about 349.0629054952.

The spelling of 42531539 in words is "forty-two million, five hundred thirty-one thousand, five hundred thirty-nine".