79223897 has 2 divisors, whose sum is σ = 79223898. Its totient is φ = 79223896.

The previous prime is 79223873. The next prime is 79223899. The reversal of 79223897 is 79832297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77510416 + 1713481 = 8804^2 + 1309^2 .

It is an emirp because it is prime and its reverse (79832297) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79223897 is a prime.

Together with 79223899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79223899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39611948 + 39611949.

It is an arithmetic number, because the mean of its divisors is an integer number (39611949).

Almost surely, 2^79223897 is an apocalyptic number.

It is an amenable number.

79223897 is a deficient number, since it is larger than the sum of its proper divisors (1).

79223897 is an equidigital number, since it uses as much as digits as its factorization.

79223897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 79223897 is about 8900.7806960963. The cubic root of 79223897 is about 429.4890216620.

Subtracting 79223897 from its reverse (79832297), we obtain a square (608400 = 780²).

The spelling of 79223897 in words is "seventy-nine million, two hundred twenty-three thousand, eight hundred ninety-seven".