80656181 has 2 divisors, whose sum is σ = 80656182. Its totient is φ = 80656180.

The previous prime is 80656151. The next prime is 80656207. The reversal of 80656181 is 18165608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 2775556 = 8825^2 + 1666^2 .

It is a cyclic number.

It is not a de Polignac number, because 80656181 - 2⁶ = 80656117 is a prime.

It is a super-2 number, since 2×80656181² = 13010839067009522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80656151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40328090 + 40328091.

It is an arithmetic number, because the mean of its divisors is an integer number (40328091).

Almost surely, 2^80656181 is an apocalyptic number.

It is an amenable number.

80656181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80656181 is an equidigital number, since it uses as much as digits as its factorization.

80656181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 80656181 is about 8980.8786318489. The cubic root of 80656181 is about 432.0618142142.

It can be divided in two parts, 806 and 56181, that multiplied together give a triangular number (45281886 = T₉₅₁₆).

The spelling of 80656181 in words is "eighty million, six hundred fifty-six thousand, one hundred eighty-one".