79043621 has 2 divisors, whose sum is σ = 79043622. Its totient is φ = 79043620.

The previous prime is 79043611. The next prime is 79043623. The reversal of 79043621 is 12634097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 28206721 = 7130^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 79043621 - 2¹⁰ = 79042597 is a prime.

It is a Sophie Germain prime.

Together with 79043623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79043623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39521810 + 39521811.

It is an arithmetic number, because the mean of its divisors is an integer number (39521811).

Almost surely, 2^79043621 is an apocalyptic number.

It is an amenable number.

79043621 is a deficient number, since it is larger than the sum of its proper divisors (1).

79043621 is an equidigital number, since it uses as much as digits as its factorization.

79043621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 79043621 is about 8890.6479516400. The cubic root of 79043621 is about 429.1630031715.

The spelling of 79043621 in words is "seventy-nine million, forty-three thousand, six hundred twenty-one".