820162771 has 4 divisors (see below), whose sum is σ = 820420000. Its totient is φ = 819905544.

The previous prime is 820162741. The next prime is 820162787. The reversal of 820162771 is 177261028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820162771 - 2¹¹ = 820160723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820162741) 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, 123771 + ... + 130228.

It is an arithmetic number, because the mean of its divisors is an integer number (205105000).

Almost surely, 2^820162771 is an apocalyptic number.

820162771 is a deficient number, since it is larger than the sum of its proper divisors (257229).

820162771 is a wasteful number, since it uses less digits than its factorization.

820162771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257228.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 820162771 is about 28638.4840904682. The cubic root of 820162771 is about 936.0520899463.

The spelling of 820162771 in words is "eight hundred twenty million, one hundred sixty-two thousand, seven hundred seventy-one".