821077473 has 4 divisors (see below), whose sum is σ = 1094769968. Its totient is φ = 547384980.

The previous prime is 821077427. The next prime is 821077513. The reversal of 821077473 is 374770128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 821077473 - 2⁹ = 821076961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (821077423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136846243 + ... + 136846248.

It is an arithmetic number, because the mean of its divisors is an integer number (273692492).

Almost surely, 2^821077473 is an apocalyptic number.

It is an amenable number.

821077473 is a deficient number, since it is larger than the sum of its proper divisors (273692495).

821077473 is a wasteful number, since it uses less digits than its factorization.

821077473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273692494.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 821077473 is about 28654.4494450687. The cubic root of 821077473 is about 936.3999439110.

The spelling of 821077473 in words is "eight hundred twenty-one million, seventy-seven thousand, four hundred seventy-three".