42124091 has 2 divisors, whose sum is σ = 42124092. Its totient is φ = 42124090.

The previous prime is 42124073. The next prime is 42124111. The reversal of 42124091 is 19042124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42124091 - 2¹⁸ = 41861947 is a prime.

It is not a weakly prime, because it can be changed into another prime (42124001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21062045 + 21062046.

It is an arithmetic number, because the mean of its divisors is an integer number (21062046).

Almost surely, 2^42124091 is an apocalyptic number.

42124091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42124091 is an equidigital number, since it uses as much as digits as its factorization.

42124091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 42124091 is about 6490.3074657523. The cubic root of 42124091 is about 347.9446640997.

The spelling of 42124091 in words is "forty-two million, one hundred twenty-four thousand, ninety-one".