42550549 has 2 divisors, whose sum is σ = 42550550. Its totient is φ = 42550548.

The previous prime is 42550537. The next prime is 42550559. The reversal of 42550549 is 94505524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40640625 + 1909924 = 6375^2 + 1382^2 .

It is a cyclic number.

It is not a de Polignac number, because 42550549 - 2⁷ = 42550421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42550559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21275274 + 21275275.

It is an arithmetic number, because the mean of its divisors is an integer number (21275275).

Almost surely, 2^42550549 is an apocalyptic number.

It is an amenable number.

42550549 is a deficient number, since it is larger than the sum of its proper divisors (1).

42550549 is an equidigital number, since it uses as much as digits as its factorization.

42550549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 42550549 is about 6523.0781844157. The cubic root of 42550549 is about 349.1149037503.

The spelling of 42550549 in words is "forty-two million, five hundred fifty thousand, five hundred forty-nine".