80981091 has 24 divisors (see below), whose sum is σ = 123901440. Its totient is φ = 50860656.

The previous prime is 80981077. The next prime is 80981113. The reversal of 80981091 is 19018908.

It is a de Polignac number, because none of the positive numbers 2^k-80981091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80981051) 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, 10950 + ... + 16788.

It is an arithmetic number, because the mean of its divisors is an integer number (5162560).

Almost surely, 2^80981091 is an apocalyptic number.

80981091 is a deficient number, since it is larger than the sum of its proper divisors (42920349).

80981091 is a wasteful number, since it uses less digits than its factorization.

80981091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935 (or 5932 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 80981091 is about 8998.9494386845. The cubic root of 80981091 is about 432.6411999570.

Adding to 80981091 its reverse (19018908), we get a palindrome (99999999).

The spelling of 80981091 in words is "eighty million, nine hundred eighty-one thousand, ninety-one".