80211681 has 16 divisors (see below), whose sum is σ = 129635520. Its totient is φ = 48612960.

The previous prime is 80211679. The next prime is 80211707. The reversal of 80211681 is 18611208.

It is not a de Polignac number, because 80211681 - 2¹ = 80211679 is a prime.

It is a super-2 number, since 2×80211681² = 12867827537691522, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80216681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134740 + ... + 135333.

It is an arithmetic number, because the mean of its divisors is an integer number (8102220).

Almost surely, 2^80211681 is an apocalyptic number.

It is an amenable number.

80211681 is a deficient number, since it is larger than the sum of its proper divisors (49423839).

80211681 is a wasteful number, since it uses less digits than its factorization.

80211681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270093 (or 270087 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 80211681 is about 8956.0974201937. The cubic root of 80211681 is about 431.2666473725.

Adding to 80211681 its reverse (18611208), we get a palindrome (98822889).

The spelling of 80211681 in words is "eighty million, two hundred eleven thousand, six hundred eighty-one".