2153537591 has 4 divisors (see below), whose sum is σ = 2156338800. Its totient is φ = 2150736384.

The previous prime is 2153537579. The next prime is 2153537599. The reversal of 2153537591 is 1957353512.

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

It is a cyclic number.

It is not a de Polignac number, because 2153537591 - 2⁶ = 2153537527 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 (2153537599) 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, 1399451 + ... + 1400988.

It is an arithmetic number, because the mean of its divisors is an integer number (539084700).

Almost surely, 2^2153537591 is an apocalyptic number.

2153537591 is a deficient number, since it is larger than the sum of its proper divisors (2801209).

2153537591 is an equidigital number, since it uses as much as digits as its factorization.

2153537591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801208.

The product of its digits is 141750, while the sum is 41.

The square root of 2153537591 is about 46406.2236235615. The cubic root of 2153537591 is about 1291.3703745471.

The spelling of 2153537591 in words is "two billion, one hundred fifty-three million, five hundred thirty-seven thousand, five hundred ninety-one".