42491489 has 2 divisors, whose sum is σ = 42491490. Its totient is φ = 42491488.

The previous prime is 42491473. The next prime is 42491497. The reversal of 42491489 is 98419424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 824464 = 6455^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 42491489 - 2⁴ = 42491473 is a prime.

It is not a weakly prime, because it can be changed into another prime (42491389) 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, 21245744 + 21245745.

It is an arithmetic number, because the mean of its divisors is an integer number (21245745).

Almost surely, 2^42491489 is an apocalyptic number.

It is an amenable number.

42491489 is a deficient number, since it is larger than the sum of its proper divisors (1).

42491489 is an equidigital number, since it uses as much as digits as its factorization.

42491489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 42491489 is about 6518.5496086169. The cubic root of 42491489 is about 348.9533055756.

The spelling of 42491489 in words is "forty-two million, four hundred ninety-one thousand, four hundred eighty-nine".