42455813 has 2 divisors, whose sum is σ = 42455814. Its totient is φ = 42455812.

The previous prime is 42455807. The next prime is 42455821. The reversal of 42455813 is 31855424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34492129 + 7963684 = 5873^2 + 2822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42455813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42455813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42455873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21227906 + 21227907.

It is an arithmetic number, because the mean of its divisors is an integer number (21227907).

Almost surely, 2^42455813 is an apocalyptic number.

It is an amenable number.

42455813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42455813 is an equidigital number, since it uses as much as digits as its factorization.

42455813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 32.

The square root of 42455813 is about 6515.8125356704. The cubic root of 42455813 is about 348.8556174331.

The spelling of 42455813 in words is "forty-two million, four hundred fifty-five thousand, eight hundred thirteen".