42804991 has 2 divisors, whose sum is σ = 42804992. Its totient is φ = 42804990.

The previous prime is 42804961. The next prime is 42805003. The reversal of 42804991 is 19940824.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42804991 - 2⁵ = 42804959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42804991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42804901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21402495 + 21402496.

It is an arithmetic number, because the mean of its divisors is an integer number (21402496).

Almost surely, 2^42804991 is an apocalyptic number.

42804991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42804991 is an equidigital number, since it uses as much as digits as its factorization.

42804991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 42804991 is about 6542.5523307040. The cubic root of 42804991 is about 349.8093955384.

The spelling of 42804991 in words is "forty-two million, eight hundred four thousand, nine hundred ninety-one".