42491317 has 4 divisors (see below), whose sum is σ = 46354176. Its totient is φ = 38628460.

The previous prime is 42491303. The next prime is 42491341. The reversal of 42491317 is 71319424.

42491317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42491317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42491357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1931413 + ... + 1931434.

It is an arithmetic number, because the mean of its divisors is an integer number (11588544).

Almost surely, 2^42491317 is an apocalyptic number.

It is an amenable number.

42491317 is a deficient number, since it is larger than the sum of its proper divisors (3862859).

42491317 is a wasteful number, since it uses less digits than its factorization.

42491317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862858.

The product of its digits is 6048, while the sum is 31.

The square root of 42491317 is about 6518.5364154847. The cubic root of 42491317 is about 348.9528347359.

The spelling of 42491317 in words is "forty-two million, four hundred ninety-one thousand, three hundred seventeen".