80642521 has 8 divisors (see below), whose sum is σ = 82301184. Its totient is φ = 78989040.

The previous prime is 80642519. The next prime is 80642537. The reversal of 80642521 is 12524608.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80642521 - 2¹ = 80642519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80642521.

It is not an unprimeable number, because it can be changed into a prime (80642021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50680 + ... + 52246.

It is an arithmetic number, because the mean of its divisors is an integer number (10287648).

Almost surely, 2^80642521 is an apocalyptic number.

It is an amenable number.

80642521 is a deficient number, since it is larger than the sum of its proper divisors (1658663).

80642521 is a wasteful number, since it uses less digits than its factorization.

80642521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 80642521 is about 8980.1180949918. The cubic root of 80642521 is about 432.0374213840.

It can be divided in two parts, 8064 and 2521, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 80642521 in words is "eighty million, six hundred forty-two thousand, five hundred twenty-one".