80299521 has 27 divisors (see below), whose sum is σ = 121303299. Its totient is φ = 51185232.

The previous prime is 80299519. The next prime is 80299523. The reversal of 80299521 is 12599208.

The square root of 80299521 is 8961.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (80299519) and next prime (80299523).

It can be written as a sum of positive squares in only one way, i.e., 42107121 + 38192400 = 6489^2 + 6180^2 .

It is not a de Polignac number, because 80299521 - 2¹ = 80299519 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (80299523) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 779556 + ... + 779658.

Almost surely, 2^80299521 is an apocalyptic number.

80299521 is the 8961-st square number.

80299521 is the 4481-st centered octagonal number.

It is an amenable number.

80299521 is a deficient number, since it is larger than the sum of its proper divisors (41003778).

80299521 is a wasteful number, since it uses less digits than its factorization.

80299521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The cubic root of 80299521 is about 431.4240169802.

Multiplying 80299521 by its sum of digits (36), we get a square (2890782756 = 53766²).

The spelling of 80299521 in words is "eighty million, two hundred ninety-nine thousand, five hundred twenty-one".