22309813 has 2 divisors, whose sum is σ = 22309814. Its totient is φ = 22309812.

The previous prime is 22309811. The next prime is 22309817. The reversal of 22309813 is 31890322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 248004 = 4697^2 + 498^2 .

It is a cyclic number.

It is not a de Polignac number, because 22309813 - 2¹ = 22309811 is a prime.

It is a super-3 number, since 3×22309813³ (a number of 23 digits) contains 333 as substring.

Together with 22309811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22309811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11154906 + 11154907.

It is an arithmetic number, because the mean of its divisors is an integer number (11154907).

Almost surely, 2^22309813 is an apocalyptic number.

It is an amenable number.

22309813 is a deficient number, since it is larger than the sum of its proper divisors (1).

22309813 is an equidigital number, since it uses as much as digits as its factorization.

22309813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 22309813 is about 4723.3264761183. The cubic root of 22309813 is about 281.5131221227.

The spelling of 22309813 in words is "twenty-two million, three hundred nine thousand, eight hundred thirteen".