42549877 has 2 divisors, whose sum is σ = 42549878. Its totient is φ = 42549876.

The previous prime is 42549853. The next prime is 42549883. The reversal of 42549877 is 77894524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42328036 + 221841 = 6506^2 + 471^2 .

It is a cyclic number.

It is not a de Polignac number, because 42549877 - 2¹¹ = 42547829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42549817) 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, 21274938 + 21274939.

It is an arithmetic number, because the mean of its divisors is an integer number (21274939).

Almost surely, 2^42549877 is an apocalyptic number.

It is an amenable number.

42549877 is a deficient number, since it is larger than the sum of its proper divisors (1).

42549877 is an equidigital number, since it uses as much as digits as its factorization.

42549877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 46.

The square root of 42549877 is about 6523.0266747883. The cubic root of 42549877 is about 349.1130658857.

The spelling of 42549877 in words is "forty-two million, five hundred forty-nine thousand, eight hundred seventy-seven".