42091319 has 2 divisors, whose sum is σ = 42091320. Its totient is φ = 42091318.

The previous prime is 42091277. The next prime is 42091321. The reversal of 42091319 is 91319024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42091319 is a prime.

It is a super-2 number, since 2×42091319² = 3543358270319522, which contains 22 as substring.

Together with 42091321, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42091291 and 42091300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42091349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045659 + 21045660.

It is an arithmetic number, because the mean of its divisors is an integer number (21045660).

Almost surely, 2^42091319 is an apocalyptic number.

42091319 is a deficient number, since it is larger than the sum of its proper divisors (1).

42091319 is an equidigital number, since it uses as much as digits as its factorization.

42091319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 42091319 is about 6487.7822867294. The cubic root of 42091319 is about 347.8544085347.

The spelling of 42091319 in words is "forty-two million, ninety-one thousand, three hundred nineteen".