42497091 has 48 divisors (see below), whose sum is σ = 79555840. Its totient is φ = 21228480.

The previous prime is 42497069. The next prime is 42497099. The reversal of 42497091 is 19079424.

It is not a de Polignac number, because 42497091 - 2⁷ = 42496963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42497099) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14196 + ... + 16926.

Almost surely, 2^42497091 is an apocalyptic number.

42497091 is a deficient number, since it is larger than the sum of its proper divisors (37058749).

42497091 is a wasteful number, since it uses less digits than its factorization.

42497091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776 (or 2773 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 42497091 is about 6518.9792912695. The cubic root of 42497091 is about 348.9686400231.

The spelling of 42497091 in words is "forty-two million, four hundred ninety-seven thousand, ninety-one".