80616181 has 2 divisors, whose sum is σ = 80616182. Its totient is φ = 80616180.

The previous prime is 80616167. The next prime is 80616199. The reversal of 80616181 is 18161608.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 34035556 = 6825^2 + 5834^2 .

It is a cyclic number.

It is not a de Polignac number, because 80616181 - 2¹⁷ = 80485109 is a prime.

It is a super-2 number, since 2×80616181² = 12997937278049522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80616131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40308090 + 40308091.

It is an arithmetic number, because the mean of its divisors is an integer number (40308091).

Almost surely, 2^80616181 is an apocalyptic number.

It is an amenable number.

80616181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80616181 is an equidigital number, since it uses as much as digits as its factorization.

80616181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 80616181 is about 8978.6514020759. The cubic root of 80616181 is about 431.9903779436.

Adding to 80616181 its reverse (18161608), we get a palindrome (98777789).

The spelling of 80616181 in words is "eighty million, six hundred sixteen thousand, one hundred eighty-one".