80891901 has 18 divisors (see below), whose sum is σ = 119648958. Its totient is φ = 52662960.

The previous prime is 80891869. The next prime is 80891903. The reversal of 80891901 is 10919808.

It can be written as a sum of positive squares in only one way, i.e., 79227801 + 1664100 = 8901^2 + 1290^2 .

It is not a de Polignac number, because 80891901 - 2⁵ = 80891869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80891903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14211 + ... + 19071.

Almost surely, 2^80891901 is an apocalyptic number.

It is an amenable number.

80891901 is a deficient number, since it is larger than the sum of its proper divisors (38757057).

80891901 is a wasteful number, since it uses less digits than its factorization.

80891901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953 (or 4907 counting only the distinct ones).

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

The square root of 80891901 is about 8993.9924949935. The cubic root of 80891901 is about 432.4823091876.

The spelling of 80891901 in words is "eighty million, eight hundred ninety-one thousand, nine hundred one".