79823521 has 2 divisors, whose sum is σ = 79823522. Its totient is φ = 79823520.

The previous prime is 79823509. The next prime is 79823567. The reversal of 79823521 is 12532897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51051025 + 28772496 = 7145^2 + 5364^2 .

It is a cyclic number.

It is not a de Polignac number, because 79823521 - 2⁵ = 79823489 is a prime.

It is not a weakly prime, because it can be changed into another prime (79823591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39911760 + 39911761.

It is an arithmetic number, because the mean of its divisors is an integer number (39911761).

Almost surely, 2^79823521 is an apocalyptic number.

It is an amenable number.

79823521 is a deficient number, since it is larger than the sum of its proper divisors (1).

79823521 is an equidigital number, since it uses as much as digits as its factorization.

79823521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 79823521 is about 8934.4009871955. The cubic root of 79823521 is about 430.5698610029.

It can be divided in two parts, 7 and 9823521, that added together give a triangular number (9823528 = T₄₄₃₂).

The spelling of 79823521 in words is "seventy-nine million, eight hundred twenty-three thousand, five hundred twenty-one".