42945691 has 4 divisors (see below), whose sum is σ = 43944472. Its totient is φ = 41946912.

The previous prime is 42945677. The next prime is 42945697. The reversal of 42945691 is 19654924.

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

It is a cyclic number.

It is not a de Polignac number, because 42945691 - 2⁵ = 42945659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42945697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499326 + ... + 499411.

It is an arithmetic number, because the mean of its divisors is an integer number (10986118).

Almost surely, 2^42945691 is an apocalyptic number.

42945691 is a deficient number, since it is larger than the sum of its proper divisors (998781).

42945691 is an equidigital number, since it uses as much as digits as its factorization.

42945691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998780.

The product of its digits is 77760, while the sum is 40.

The square root of 42945691 is about 6553.2961935197. The cubic root of 42945691 is about 350.1922508421.

The spelling of 42945691 in words is "forty-two million, nine hundred forty-five thousand, six hundred ninety-one".