42491057 has 4 divisors (see below), whose sum is σ = 48561216. Its totient is φ = 36420900.

The previous prime is 42491027. The next prime is 42491083. The reversal of 42491057 is 75019424.

It is a happy number.

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 not a de Polignac number, because 42491057 - 2¹⁴ = 42474673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42491027) 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, 3035069 + ... + 3035082.

It is an arithmetic number, because the mean of its divisors is an integer number (12140304).

Almost surely, 2^42491057 is an apocalyptic number.

It is an amenable number.

42491057 is a deficient number, since it is larger than the sum of its proper divisors (6070159).

42491057 is an equidigital number, since it uses as much as digits as its factorization.

42491057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6070158.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 42491057 is about 6518.5164723271. The cubic root of 42491057 is about 348.9521229989.

The spelling of 42491057 in words is "forty-two million, four hundred ninety-one thousand, fifty-seven".