42091523 has 2 divisors, whose sum is σ = 42091524. Its totient is φ = 42091522.

The previous prime is 42091519. The next prime is 42091529. The reversal of 42091523 is 32519024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42091523 - 2² = 42091519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42091492 and 42091501.

It is not a weakly prime, because it can be changed into another prime (42091529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045761 + 21045762.

It is an arithmetic number, because the mean of its divisors is an integer number (21045762).

Almost surely, 2^42091523 is an apocalyptic number.

42091523 is a deficient number, since it is larger than the sum of its proper divisors (1).

42091523 is an equidigital number, since it uses as much as digits as its factorization.

42091523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 42091523 is about 6487.7980085696. The cubic root of 42091523 is about 347.8549705047.

The spelling of 42091523 in words is "forty-two million, ninety-one thousand, five hundred twenty-three".