79034821 has 2 divisors, whose sum is σ = 79034822. Its totient is φ = 79034820.

The previous prime is 79034803. The next prime is 79034827. The reversal of 79034821 is 12843097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40768225 + 38266596 = 6385^2 + 6186^2 .

It is an emirp because it is prime and its reverse (12843097) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79034821 is a prime.

It is equal to p_4616368 and since 79034821 and 4616368 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79034827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39517410 + 39517411.

It is an arithmetic number, because the mean of its divisors is an integer number (39517411).

Almost surely, 2^79034821 is an apocalyptic number.

It is an amenable number.

79034821 is a deficient number, since it is larger than the sum of its proper divisors (1).

79034821 is an equidigital number, since it uses as much as digits as its factorization.

79034821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 79034821 is about 8890.1530358032. The cubic root of 79034821 is about 429.1470762080.

The spelling of 79034821 in words is "seventy-nine million, thirty-four thousand, eight hundred twenty-one".