2081531653 has 4 divisors (see below), whose sum is σ = 2081628288. Its totient is φ = 2081435020.

The previous prime is 2081531581. The next prime is 2081531657. The reversal of 2081531653 is 3561351802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2081531653 - 2²¹ = 2079434501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081531657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300 + ... + 64522.

It is an arithmetic number, because the mean of its divisors is an integer number (520407072).

Almost surely, 2^2081531653 is an apocalyptic number.

It is an amenable number.

2081531653 is a deficient number, since it is larger than the sum of its proper divisors (96635).

2081531653 is an equidigital number, since it uses as much as digits as its factorization.

2081531653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96634.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 2081531653 is about 45623.8057706720. The cubic root of 2081531653 is about 1276.8141092368.

The spelling of 2081531653 in words is "two billion, eighty-one million, five hundred thirty-one thousand, six hundred fifty-three".