42539131517 has 12 divisors (see below), whose sum is σ = 43247492244. Its totient is φ = 41841964800.

The previous prime is 42539131499. The next prime is 42539131529. The reversal of 42539131517 is 71513193524.

It can be written as a sum of positive squares in 6 ways, for example, as 173554276 + 42365577241 = 13174^2 + 205829^2 .

It is not a de Polignac number, because 42539131517 - 2³² = 38244164221 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42539137517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1977017 + ... + 1998417.

It is an arithmetic number, because the mean of its divisors is an integer number (3603957687).

Almost surely, 2^42539131517 is an apocalyptic number.

It is an amenable number.

42539131517 is a deficient number, since it is larger than the sum of its proper divisors (708360727).

42539131517 is an equidigital number, since it uses as much as digits as its factorization.

42539131517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21920 (or 21847 counting only the distinct ones).

The product of its digits is 113400, while the sum is 41.

The spelling of 42539131517 in words is "forty-two billion, five hundred thirty-nine million, one hundred thirty-one thousand, five hundred seventeen".