80621109 has 24 divisors (see below), whose sum is σ = 121849280. Its totient is φ = 52683696.

The previous prime is 80621071. The next prime is 80621119. The reversal of 80621109 is 90112608.

It is not a de Polignac number, because 80621109 - 2¹¹ = 80619061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80621119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75312 + ... + 76374.

Almost surely, 2^80621109 is an apocalyptic number.

It is an amenable number.

80621109 is a deficient number, since it is larger than the sum of its proper divisors (41228171).

80621109 is a wasteful number, since it uses less digits than its factorization.

80621109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 80621109 is about 8978.9258266231. The cubic root of 80621109 is about 431.9991801682. Note that the first 3 decimals are identical.

The spelling of 80621109 in words is "eighty million, six hundred twenty-one thousand, one hundred nine".