2171553491 has 4 divisors (see below), whose sum is σ = 2285845800. Its totient is φ = 2057261184.

The previous prime is 2171553467. The next prime is 2171553509. The reversal of 2171553491 is 1943551712.

2171553491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2171553491 - 2⁶ = 2171553427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171553401) 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, 57146126 + ... + 57146163.

It is an arithmetic number, because the mean of its divisors is an integer number (571461450).

Almost surely, 2^2171553491 is an apocalyptic number.

2171553491 is a deficient number, since it is larger than the sum of its proper divisors (114292309).

2171553491 is a wasteful number, since it uses less digits than its factorization.

2171553491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114292308.

The product of its digits is 37800, while the sum is 38.

The square root of 2171553491 is about 46599.9301608919. The cubic root of 2171553491 is about 1294.9614615624.

The spelling of 2171553491 in words is "two billion, one hundred seventy-one million, five hundred fifty-three thousand, four hundred ninety-one".