42491285 has 4 divisors (see below), whose sum is σ = 50989548. Its totient is φ = 33993024.

The previous prime is 42491261. The next prime is 42491303. The reversal of 42491285 is 58219424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32103556 + 10387729 = 5666^2 + 3223^2 .

It is a cyclic number.

It is not a de Polignac number, because 42491285 - 2⁶ = 42491221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4249124 + ... + 4249133.

It is an arithmetic number, because the mean of its divisors is an integer number (12747387).

Almost surely, 2^42491285 is an apocalyptic number.

It is an amenable number.

42491285 is a deficient number, since it is larger than the sum of its proper divisors (8498263).

42491285 is an equidigital number, since it uses as much as digits as its factorization.

42491285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8498262.

The product of its digits is 23040, while the sum is 35.

The square root of 42491285 is about 6518.5339609455. The cubic root of 42491285 is about 348.9527471376.

The spelling of 42491285 in words is "forty-two million, four hundred ninety-one thousand, two hundred eighty-five".