42102539 has 2 divisors, whose sum is σ = 42102540. Its totient is φ = 42102538.

The previous prime is 42102527. The next prime is 42102563. The reversal of 42102539 is 93520124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42102539 - 2⁸ = 42102283 is a prime.

It is not a weakly prime, because it can be changed into another prime (42102509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21051269 + 21051270.

It is an arithmetic number, because the mean of its divisors is an integer number (21051270).

Almost surely, 2^42102539 is an apocalyptic number.

42102539 is a deficient number, since it is larger than the sum of its proper divisors (1).

42102539 is an equidigital number, since it uses as much as digits as its factorization.

42102539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 42102539 is about 6488.6469313717. The cubic root of 42102539 is about 347.8853141926.

The spelling of 42102539 in words is "forty-two million, one hundred two thousand, five hundred thirty-nine".