80921089 has 4 divisors (see below), whose sum is σ = 82447956. Its totient is φ = 79394224.

The previous prime is 80921077. The next prime is 80921111. The reversal of 80921089 is 98012908.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56250000 + 24671089 = 7500^2 + 4967^2 .

It is a cyclic number.

It is not a de Polignac number, because 80921089 - 2¹⁵ = 80888321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80921069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763354 + ... + 763459.

It is an arithmetic number, because the mean of its divisors is an integer number (20611989).

Almost surely, 2^80921089 is an apocalyptic number.

It is an amenable number.

80921089 is a deficient number, since it is larger than the sum of its proper divisors (1526867).

80921089 is a wasteful number, since it uses less digits than its factorization.

80921089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526866.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 80921089 is about 8995.6149873147. The cubic root of 80921089 is about 432.5343200627.

It can be divided in two parts, 8092 and 1089, that multiplied together give a palindrome (8812188).

The spelling of 80921089 in words is "eighty million, nine hundred twenty-one thousand, eighty-nine".