80815477 has 2 divisors, whose sum is σ = 80815478. Its totient is φ = 80815476.

The previous prime is 80815459. The next prime is 80815519. The reversal of 80815477 is 77451808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63584676 + 17230801 = 7974^2 + 4151^2 .

It is a cyclic number.

It is not a de Polignac number, because 80815477 - 2⁷ = 80815349 is a prime.

It is a super-3 number, since 3×80815477³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80815177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40407738 + 40407739.

It is an arithmetic number, because the mean of its divisors is an integer number (40407739).

Almost surely, 2^80815477 is an apocalyptic number.

It is an amenable number.

80815477 is a deficient number, since it is larger than the sum of its proper divisors (1).

80815477 is an equidigital number, since it uses as much as digits as its factorization.

80815477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 80815477 is about 8989.7428773019. The cubic root of 80815477 is about 432.3460679328.

The spelling of 80815477 in words is "eighty million, eight hundred fifteen thousand, four hundred seventy-seven".