42809651 has 2 divisors, whose sum is σ = 42809652. Its totient is φ = 42809650.

The previous prime is 42809593. The next prime is 42809653. The reversal of 42809651 is 15690824.

42809651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42809651 - 2¹⁰ = 42808627 is a prime.

Together with 42809653, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2593817 and since 42809651 and 2593817 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42809653) 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, 21404825 + 21404826.

It is an arithmetic number, because the mean of its divisors is an integer number (21404826).

Almost surely, 2^42809651 is an apocalyptic number.

42809651 is a deficient number, since it is larger than the sum of its proper divisors (1).

42809651 is an equidigital number, since it uses as much as digits as its factorization.

42809651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 42809651 is about 6542.9084511401. The cubic root of 42809651 is about 349.8220891721.

It can be divided in two parts, 4280 and 9651, that added together give a palindrome (13931).

The spelling of 42809651 in words is "forty-two million, eight hundred nine thousand, six hundred fifty-one".