805121477 has 2 divisors, whose sum is σ = 805121478. Its totient is φ = 805121476.

The previous prime is 805121459. The next prime is 805121533. The reversal of 805121477 is 774121508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 454158721 + 350962756 = 21311^2 + 18734^2 .

It is a cyclic number.

It is not a de Polignac number, because 805121477 - 2²² = 800927173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805121077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402560738 + 402560739.

It is an arithmetic number, because the mean of its divisors is an integer number (402560739).

Almost surely, 2^805121477 is an apocalyptic number.

It is an amenable number.

805121477 is a deficient number, since it is larger than the sum of its proper divisors (1).

805121477 is an equidigital number, since it uses as much as digits as its factorization.

805121477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 805121477 is about 28374.6625883023. The cubic root of 805121477 is about 930.2945369162.

The spelling of 805121477 in words is "eight hundred five million, one hundred twenty-one thousand, four hundred seventy-seven".