80811653 has 4 divisors (see below), whose sum is σ = 87027948. Its totient is φ = 74595360.

The previous prime is 80811631. The next prime is 80811667. The reversal of 80811653 is 35611808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7828804 + 72982849 = 2798^2 + 8543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80811653 is a prime.

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 (80811683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3108128 + ... + 3108153.

It is an arithmetic number, because the mean of its divisors is an integer number (21756987).

Almost surely, 2^80811653 is an apocalyptic number.

It is an amenable number.

80811653 is a deficient number, since it is larger than the sum of its proper divisors (6216295).

80811653 is a wasteful number, since it uses less digits than its factorization.

80811653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216294.

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

The square root of 80811653 is about 8989.5301879464. The cubic root of 80811653 is about 432.3392486225.

The spelling of 80811653 in words is "eighty million, eight hundred eleven thousand, six hundred fifty-three".