42042631849 has 3 divisors (see below), whose sum is σ = 42042836893. Its totient is φ = 42042426806.

The previous prime is 42042631819. The next prime is 42042631921. The reversal of 42042631849 is 94813624024.

The square root of 42042631849 is 205043.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 42042631849 - 2²³ = 42034243241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42042631819) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 102522 + ... + 307564.

Almost surely, 2^42042631849 is an apocalyptic number.

42042631849 is the 205043-rd square number.

42042631849 is the 102522-nd centered octagonal number.

It is an amenable number.

42042631849 is a deficient number, since it is larger than the sum of its proper divisors (205044).

42042631849 is an frugal number, since it uses more digits than its factorization.

42042631849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410086 (or 205043 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 42042631849 in words is "forty-two billion, forty-two million, six hundred thirty-one thousand, eight hundred forty-nine".