5591643121 has 4 divisors (see below), whose sum is σ = 5594780992. Its totient is φ = 5588505252.

The previous prime is 5591643107. The next prime is 5591643193. The reversal of 5591643121 is 1213461955.

5591643121 is digitally balanced in base 3, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5591643121 - 2¹³ = 5591634929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5591640121) 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, 1566261 + ... + 1569826.

It is an arithmetic number, because the mean of its divisors is an integer number (1398695248).

Almost surely, 2^5591643121 is an apocalyptic number.

It is an amenable number.

5591643121 is a deficient number, since it is larger than the sum of its proper divisors (3137871).

5591643121 is a wasteful number, since it uses less digits than its factorization.

5591643121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137870.

The product of its digits is 32400, while the sum is 37.

The square root of 5591643121 is about 74777.2901421280. The cubic root of 5591643121 is about 1774.9242177260.

The spelling of 5591643121 in words is "five billion, five hundred ninety-one million, six hundred forty-three thousand, one hundred twenty-one".