821252931 has 8 divisors (see below), whose sum is σ = 1095562944. Its totient is φ = 547222440.

The previous prime is 821252921. The next prime is 821252951. The reversal of 821252931 is 139252128.

It is a happy number.

821252931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 821252931 - 2¹⁴ = 821236547 is a prime.

It is a super-2 number, since 2×821252931² = 1348912753352181522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 821252892 and 821252901.

It is not an unprimeable number, because it can be changed into a prime (821252921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62925 + ... + 74846.

It is an arithmetic number, because the mean of its divisors is an integer number (136945368).

Almost surely, 2^821252931 is an apocalyptic number.

821252931 is a deficient number, since it is larger than the sum of its proper divisors (274310013).

821252931 is a wasteful number, since it uses less digits than its factorization.

821252931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139761.

The product of its digits is 8640, while the sum is 33.

The square root of 821252931 is about 28657.5109002858. The cubic root of 821252931 is about 936.4666396716.

The spelling of 821252931 in words is "eight hundred twenty-one million, two hundred fifty-two thousand, nine hundred thirty-one".