2175531645 has 48 divisors (see below), whose sum is σ = 4055375808. Its totient is φ = 993000960.

The previous prime is 2175531643. The next prime is 2175531691. The reversal of 2175531645 is 5461355712.

It is not a de Polignac number, because 2175531645 - 2¹ = 2175531643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2175531643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 576565 + ... + 580325.

It is an arithmetic number, because the mean of its divisors is an integer number (84486996).

Almost surely, 2^2175531645 is an apocalyptic number.

It is an amenable number.

2175531645 is a deficient number, since it is larger than the sum of its proper divisors (1879844163).

2175531645 is a wasteful number, since it uses less digits than its factorization.

2175531645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570 (or 4563 counting only the distinct ones).

The product of its digits is 126000, while the sum is 39.

The square root of 2175531645 is about 46642.5947498636. The cubic root of 2175531645 is about 1295.7517427379.

The spelling of 2175531645 in words is "two billion, one hundred seventy-five million, five hundred thirty-one thousand, six hundred forty-five".