80820461 has 2 divisors, whose sum is σ = 80820462. Its totient is φ = 80820460.

The previous prime is 80820457. The next prime is 80820463. The reversal of 80820461 is 16402808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80820100 + 361 = 8990^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 80820461 - 2² = 80820457 is a prime.

Together with 80820463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80820463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40410230 + 40410231.

It is an arithmetic number, because the mean of its divisors is an integer number (40410231).

Almost surely, 2^80820461 is an apocalyptic number.

It is an amenable number.

80820461 is a deficient number, since it is larger than the sum of its proper divisors (1).

80820461 is an equidigital number, since it uses as much as digits as its factorization.

80820461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 80820461 is about 8990.0200778419. The cubic root of 80820461 is about 432.3549555395.

The spelling of 80820461 in words is "eighty million, eight hundred twenty thousand, four hundred sixty-one".