42550447 has 2 divisors, whose sum is σ = 42550448. Its totient is φ = 42550446.

The previous prime is 42550421. The next prime is 42550451. The reversal of 42550447 is 74405524.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42550447 is a prime.

It is a Chen prime.

It is equal to p_2579044 and since 42550447 and 2579044 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42550147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21275223 + 21275224.

It is an arithmetic number, because the mean of its divisors is an integer number (21275224).

Almost surely, 2^42550447 is an apocalyptic number.

42550447 is a deficient number, since it is larger than the sum of its proper divisors (1).

42550447 is an equidigital number, since it uses as much as digits as its factorization.

42550447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 42550447 is about 6523.0703660163. The cubic root of 42550447 is about 349.1146247900.

The spelling of 42550447 in words is "forty-two million, five hundred fifty thousand, four hundred forty-seven".