80744861 has 2 divisors, whose sum is σ = 80744862. Its totient is φ = 80744860.

The previous prime is 80744857. The next prime is 80744899. The reversal of 80744861 is 16844708.

It is an a-pointer prime, because the next prime (80744899) can be obtained adding 80744861 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79316836 + 1428025 = 8906^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 80744861 - 2² = 80744857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80744561) 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 as a sum of consecutive naturals, namely, 40372430 + 40372431.

It is an arithmetic number, because the mean of its divisors is an integer number (40372431).

Almost surely, 2^80744861 is an apocalyptic number.

It is an amenable number.

80744861 is a deficient number, since it is larger than the sum of its proper divisors (1).

80744861 is an equidigital number, since it uses as much as digits as its factorization.

80744861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 80744861 is about 8985.8144316473. The cubic root of 80744861 is about 432.2201042443.

The spelling of 80744861 in words is "eighty million, seven hundred forty-four thousand, eight hundred sixty-one".