80135681 has 4 divisors (see below), whose sum is σ = 80393664. Its totient is φ = 79877700.

The previous prime is 80135669. The next prime is 80135683. The reversal of 80135681 is 18653108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80135681 is a prime.

It is a super-2 number, since 2×80135681² = 12843454738667522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80135683) 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, 128525 + ... + 129146.

It is an arithmetic number, because the mean of its divisors is an integer number (20098416).

Almost surely, 2^80135681 is an apocalyptic number.

It is an amenable number.

80135681 is a deficient number, since it is larger than the sum of its proper divisors (257983).

80135681 is a wasteful number, since it uses less digits than its factorization.

80135681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257982.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 80135681 is about 8951.8534952266. The cubic root of 80135681 is about 431.1303969660.

Adding to 80135681 its reverse (18653108), we get a palindrome (98788789).

The spelling of 80135681 in words is "eighty million, one hundred thirty-five thousand, six hundred eighty-one".