5631118121 has 4 divisors (see below), whose sum is σ = 5631642000. Its totient is φ = 5630594244.

The previous prime is 5631118117. The next prime is 5631118127. The reversal of 5631118121 is 1218111365.

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 5631118121 - 2² = 5631118117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5631118127) 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, 245471 + ... + 267428.

It is an arithmetic number, because the mean of its divisors is an integer number (1407910500).

Almost surely, 2^5631118121 is an apocalyptic number.

It is an amenable number.

5631118121 is a deficient number, since it is larger than the sum of its proper divisors (523879).

5631118121 is a wasteful number, since it uses less digits than its factorization.

5631118121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523878.

The product of its digits is 1440, while the sum is 29.

The square root of 5631118121 is about 75040.7763885742. The cubic root of 5631118121 is about 1779.0912039083.

Adding to 5631118121 its reverse (1218111365), we get a palindrome (6849229486).

The spelling of 5631118121 in words is "five billion, six hundred thirty-one million, one hundred eighteen thousand, one hundred twenty-one".