42537139 has 2 divisors, whose sum is σ = 42537140. Its totient is φ = 42537138.

The previous prime is 42537137. The next prime is 42537149. The reversal of 42537139 is 93173524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42537139 - 2¹ = 42537137 is a prime.

Together with 42537137, it forms a pair of twin primes.

It is equal to p_2578291 and since 42537139 and 2578291 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42537137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21268569 + 21268570.

It is an arithmetic number, because the mean of its divisors is an integer number (21268570).

Almost surely, 2^42537139 is an apocalyptic number.

42537139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42537139 is an equidigital number, since it uses as much as digits as its factorization.

42537139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 42537139 is about 6522.0502144648. The cubic root of 42537139 is about 349.0782248443.

The spelling of 42537139 in words is "forty-two million, five hundred thirty-seven thousand, one hundred thirty-nine".