80944561 has 2 divisors, whose sum is σ = 80944562. Its totient is φ = 80944560.

The previous prime is 80944547. The next prime is 80944603. The reversal of 80944561 is 16544908.

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., 58675600 + 22268961 = 7660^2 + 4719^2 .

It is a cyclic number.

It is not a de Polignac number, because 80944561 - 2⁵ = 80944529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80944561.

It is not a weakly prime, because it can be changed into another prime (80944511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40472280 + 40472281.

It is an arithmetic number, because the mean of its divisors is an integer number (40472281).

Almost surely, 2^80944561 is an apocalyptic number.

It is an amenable number.

80944561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80944561 is an equidigital number, since it uses as much as digits as its factorization.

80944561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 80944561 is about 8996.9195283719. The cubic root of 80944561 is about 432.5761363730.

The spelling of 80944561 in words is "eighty million, nine hundred forty-four thousand, five hundred sixty-one".