42788491 has 2 divisors, whose sum is σ = 42788492. Its totient is φ = 42788490.

The previous prime is 42788489. The next prime is 42788519. The reversal of 42788491 is 19488724.

42788491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42788491 - 2¹ = 42788489 is a prime.

Together with 42788489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42788791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21394245 + 21394246.

It is an arithmetic number, because the mean of its divisors is an integer number (21394246).

Almost surely, 2^42788491 is an apocalyptic number.

42788491 is a deficient number, since it is larger than the sum of its proper divisors (1).

42788491 is an equidigital number, since it uses as much as digits as its factorization.

42788491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 42788491 is about 6541.2912333881. The cubic root of 42788491 is about 349.7644428614.

It can be divided in two parts, 4278 and 8491, that added together give a square (12769 = 113²).

The spelling of 42788491 in words is "forty-two million, seven hundred eighty-eight thousand, four hundred ninety-one".