42491027 has 2 divisors, whose sum is σ = 42491028. Its totient is φ = 42491026.

The previous prime is 42491023. The next prime is 42491083. The reversal of 42491027 is 72019424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42491027 - 2² = 42491023 is a prime.

It is not a weakly prime, because it can be changed into another prime (42491021) 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, 21245513 + 21245514.

It is an arithmetic number, because the mean of its divisors is an integer number (21245514).

Almost surely, 2^42491027 is an apocalyptic number.

42491027 is a deficient number, since it is larger than the sum of its proper divisors (1).

42491027 is an equidigital number, since it uses as much as digits as its factorization.

42491027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 42491027 is about 6518.5141711896. The cubic root of 42491027 is about 348.9520408752.

The spelling of 42491027 in words is "forty-two million, four hundred ninety-one thousand, twenty-seven".