2153471765 has 4 divisors (see below), whose sum is σ = 2584166124. Its totient is φ = 1722777408.

The previous prime is 2153471737. The next prime is 2153471783. The reversal of 2153471765 is 5671743512.

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 1070140369 + 1083331396 = 32713^2 + 32914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153471765 - 2¹⁸ = 2153209621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215347172 + ... + 215347181.

It is an arithmetic number, because the mean of its divisors is an integer number (646041531).

Almost surely, 2^2153471765 is an apocalyptic number.

It is an amenable number.

2153471765 is a deficient number, since it is larger than the sum of its proper divisors (430694359).

2153471765 is an equidigital number, since it uses as much as digits as its factorization.

2153471765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430694358.

The product of its digits is 176400, while the sum is 41.

The square root of 2153471765 is about 46405.5143813750. The cubic root of 2153471765 is about 1291.3572168768.

The spelling of 2153471765 in words is "two billion, one hundred fifty-three million, four hundred seventy-one thousand, seven hundred sixty-five".