22078013 has 2 divisors, whose sum is σ = 22078014. Its totient is φ = 22078012.

The previous prime is 22078009. The next prime is 22078033. The reversal of 22078013 is 31087022.

22078013 = 3322² + 3323².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11042329 + 11035684 = 3323^2 + 3322^2 .

It is a cyclic number.

It is not a de Polignac number, because 22078013 - 2² = 22078009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22078013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22078003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11039006 + 11039007.

It is an arithmetic number, because the mean of its divisors is an integer number (11039007).

Almost surely, 2^22078013 is an apocalyptic number.

22078013 is the 3323-rd centered square number.

It is an amenable number.

22078013 is a deficient number, since it is larger than the sum of its proper divisors (1).

22078013 is an equidigital number, since it uses as much as digits as its factorization.

22078013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 22078013 is about 4698.7246141905. The cubic root of 22078013 is about 280.5347476397.

Subtracting 22078013 from its reverse (31087022), we obtain a palindrome (9009009).

The spelling of 22078013 in words is "twenty-two million, seventy-eight thousand, thirteen".