872521633 has 4 divisors (see below), whose sum is σ = 873752980. Its totient is φ = 871290288.

The previous prime is 872521631. The next prime is 872521673. The reversal of 872521633 is 336125278.

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

It can be written as a sum of positive squares in 2 ways, for example, as 181252369 + 691269264 = 13463^2 + 26292^2 .

It is a cyclic number.

It is not a de Polignac number, because 872521633 - 2¹ = 872521631 is a prime.

It is a super-2 number, since 2×872521633² = 1522588000105973378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 872521592 and 872521601.

It is not an unprimeable number, because it can be changed into a prime (872521631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614610 + ... + 616027.

It is an arithmetic number, because the mean of its divisors is an integer number (218438245).

Almost surely, 2^872521633 is an apocalyptic number.

It is an amenable number.

872521633 is a deficient number, since it is larger than the sum of its proper divisors (1231347).

872521633 is a wasteful number, since it uses less digits than its factorization.

872521633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231346.

The product of its digits is 60480, while the sum is 37.

The square root of 872521633 is about 29538.4771611537. The cubic root of 872521633 is about 955.5617002074.

The spelling of 872521633 in words is "eight hundred seventy-two million, five hundred twenty-one thousand, six hundred thirty-three".