42550831 has 2 divisors, whose sum is σ = 42550832. Its totient is φ = 42550830.

The previous prime is 42550799. The next prime is 42550877. The reversal of 42550831 is 13805524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42550831 - 2⁵ = 42550799 is a prime.

It is a super-2 number, since 2×42550831² = 3621146437581122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42550831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42550231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21275415 + 21275416.

It is an arithmetic number, because the mean of its divisors is an integer number (21275416).

Almost surely, 2^42550831 is an apocalyptic number.

42550831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42550831 is an equidigital number, since it uses as much as digits as its factorization.

42550831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 42550831 is about 6523.0997999417. The cubic root of 42550831 is about 349.1156749913.

The spelling of 42550831 in words is "forty-two million, five hundred fifty thousand, eight hundred thirty-one".