821612631 has 16 divisors (see below), whose sum is σ = 1253145600. Its totient is φ = 469056288.

The previous prime is 821612609. The next prime is 821612633. The reversal of 821612631 is 136216128.

821612631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 821612631 - 2¹⁰ = 821611607 is a prime.

It is a super-2 number, since 2×821612631² = 1350094630837484322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821612633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5650 + ... + 40928.

It is an arithmetic number, because the mean of its divisors is an integer number (78321600).

Almost surely, 2^821612631 is an apocalyptic number.

821612631 is a deficient number, since it is larger than the sum of its proper divisors (431532969).

821612631 is a wasteful number, since it uses less digits than its factorization.

821612631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36398.

The product of its digits is 3456, while the sum is 30.

The square root of 821612631 is about 28663.7860548812. The cubic root of 821612631 is about 936.6033405064.

Adding to 821612631 its reverse (136216128), we get a palindrome (957828759).

The spelling of 821612631 in words is "eight hundred twenty-one million, six hundred twelve thousand, six hundred thirty-one".