42491413 has 4 divisors (see below), whose sum is σ = 42504768. Its totient is φ = 42478060.

The previous prime is 42491401. The next prime is 42491417. The reversal of 42491413 is 31419424.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42491413 - 2²⁵ = 8936981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42491417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170 + ... + 9292.

It is an arithmetic number, because the mean of its divisors is an integer number (10626192).

Almost surely, 2^42491413 is an apocalyptic number.

It is an amenable number.

42491413 is a deficient number, since it is larger than the sum of its proper divisors (13355).

42491413 is an equidigital number, since it uses as much as digits as its factorization.

42491413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13354.

The product of its digits is 3456, while the sum is 28.

The square root of 42491413 is about 6518.5437790967. The cubic root of 42491413 is about 348.9530975303.

The spelling of 42491413 in words is "forty-two million, four hundred ninety-one thousand, four hundred thirteen".