820677047 has 2 divisors, whose sum is σ = 820677048. Its totient is φ = 820677046.

The previous prime is 820677019. The next prime is 820677073. The reversal of 820677047 is 740776028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820677047 - 2²⁰ = 819628471 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 820676995 and 820677013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820677647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410338523 + 410338524.

It is an arithmetic number, because the mean of its divisors is an integer number (410338524).

Almost surely, 2^820677047 is an apocalyptic number.

820677047 is a deficient number, since it is larger than the sum of its proper divisors (1).

820677047 is an equidigital number, since it uses as much as digits as its factorization.

820677047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 820677047 is about 28647.4614407629. The cubic root of 820677047 is about 936.2476968671.

The spelling of 820677047 in words is "eight hundred twenty million, six hundred seventy-seven thousand, forty-seven".