42550451 has 2 divisors, whose sum is σ = 42550452. Its totient is φ = 42550450.

The previous prime is 42550447. The next prime is 42550493. The reversal of 42550451 is 15405524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42550451 - 2² = 42550447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42550451.

It is not a weakly prime, because it can be changed into another prime (42550421) 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, 21275225 + 21275226.

It is an arithmetic number, because the mean of its divisors is an integer number (21275226).

Almost surely, 2^42550451 is an apocalyptic number.

42550451 is a deficient number, since it is larger than the sum of its proper divisors (1).

42550451 is an equidigital number, since it uses as much as digits as its factorization.

42550451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 42550451 is about 6523.0706726204. The cubic root of 42550451 is about 349.1146357296.

Adding to 42550451 its reverse (15405524), we get a palindrome (57955975).

The spelling of 42550451 in words is "forty-two million, five hundred fifty thousand, four hundred fifty-one".