42551161 has 2 divisors, whose sum is σ = 42551162. Its totient is φ = 42551160.

The previous prime is 42551143. The next prime is 42551183. The reversal of 42551161 is 16115524.

It is a happy number.

42551161 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 can be written as a sum of positive squares in only one way, i.e., 37515625 + 5035536 = 6125^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 42551161 - 2⁹ = 42550649 is a prime.

It is not a weakly prime, because it can be changed into another prime (42551111) 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, 21275580 + 21275581.

It is an arithmetic number, because the mean of its divisors is an integer number (21275581).

Almost surely, 2^42551161 is an apocalyptic number.

It is an amenable number.

42551161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42551161 is an equidigital number, since it uses as much as digits as its factorization.

42551161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 42551161 is about 6523.1250946153. The cubic root of 42551161 is about 349.1165775031.

Adding to 42551161 its reverse (16115524), we get a palindrome (58666685).

The spelling of 42551161 in words is "forty-two million, five hundred fifty-one thousand, one hundred sixty-one".