42330991 has 2 divisors, whose sum is σ = 42330992. Its totient is φ = 42330990.

The previous prime is 42330989. The next prime is 42331007. The reversal of 42330991 is 19903324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42330991 - 2¹ = 42330989 is a prime.

It is a super-3 number, since 3×42330991³ (a number of 24 digits) contains 333 as substring.

Together with 42330989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42330931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21165495 + 21165496.

It is an arithmetic number, because the mean of its divisors is an integer number (21165496).

Almost surely, 2^42330991 is an apocalyptic number.

42330991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42330991 is an equidigital number, since it uses as much as digits as its factorization.

42330991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 42330991 is about 6506.2270940999. The cubic root of 42330991 is about 348.5133980977.

The spelling of 42330991 in words is "forty-two million, three hundred thirty thousand, nine hundred ninety-one".