821850831 has 12 divisors (see below), whose sum is σ = 1200457440. Its totient is φ = 541743840.

The previous prime is 821850829. The next prime is 821850851. The reversal of 821850831 is 138058128.

It is not a de Polignac number, because 821850831 - 2¹ = 821850829 is a prime.

It is a super-2 number, since 2×821850831² = 1350877576830781122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821850851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 512215 + ... + 513816.

It is an arithmetic number, because the mean of its divisors is an integer number (100038120).

Almost surely, 2^821850831 is an apocalyptic number.

821850831 is a deficient number, since it is larger than the sum of its proper divisors (378606609).

821850831 is a wasteful number, since it uses less digits than its factorization.

821850831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026126 (or 1026123 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 821850831 is about 28667.9408224588. The cubic root of 821850831 is about 936.6938443727.

It can be divided in two parts, 8218 and 50831, that added together give a 10-th power (59049 = 3¹⁰).

The spelling of 821850831 in words is "eight hundred twenty-one million, eight hundred fifty thousand, eight hundred thirty-one".