975821645 has 16 divisors (see below), whose sum is σ = 1188139008. Its totient is φ = 769305600.

The previous prime is 975821611. The next prime is 975821647. The reversal of 975821645 is 546128579.

It is a happy number.

It is not a de Polignac number, because 975821645 - 2¹⁶ = 975756109 is a prime.

It is a super-3 number, since 3×975821645³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 975821645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (975821647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90797 + ... + 100973.

It is an arithmetic number, because the mean of its divisors is an integer number (74258688).

Almost surely, 2^975821645 is an apocalyptic number.

It is an amenable number.

975821645 is a deficient number, since it is larger than the sum of its proper divisors (212317363).

975821645 is a wasteful number, since it uses less digits than its factorization.

975821645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10460.

The product of its digits is 604800, while the sum is 47.

The square root of 975821645 is about 31238.1440709912. The cubic root of 975821645 is about 991.8747067547.

The spelling of 975821645 in words is "nine hundred seventy-five million, eight hundred twenty-one thousand, six hundred forty-five".