79223813 has 2 divisors, whose sum is σ = 79223814. Its totient is φ = 79223812.

The previous prime is 79223797. The next prime is 79223839. The reversal of 79223813 is 31832297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45792289 + 33431524 = 6767^2 + 5782^2 .

It is a cyclic number.

It is not a de Polignac number, because 79223813 - 2⁴ = 79223797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79223873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39611906 + 39611907.

It is an arithmetic number, because the mean of its divisors is an integer number (39611907).

Almost surely, 2^79223813 is an apocalyptic number.

It is an amenable number.

79223813 is a deficient number, since it is larger than the sum of its proper divisors (1).

79223813 is an equidigital number, since it uses as much as digits as its factorization.

79223813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 79223813 is about 8900.7759774078. The cubic root of 79223813 is about 429.4888698681.

The spelling of 79223813 in words is "seventy-nine million, two hundred twenty-three thousand, eight hundred thirteen".