56121121 has 6 divisors (see below), whose sum is σ = 65283810. Its totient is φ = 48103776.

The previous prime is 56121101. The next prime is 56121133. The reversal of 56121121 is 12112165.

It can be written as a sum of positive squares in only one way, i.e., 45158400 + 10962721 = 6720^2 + 3311^2 .

It is not a de Polignac number, because 56121121 - 2⁵ = 56121089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56121101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572616 + ... + 572713.

It is an arithmetic number, because the mean of its divisors is an integer number (10880635).

Almost surely, 2^56121121 is an apocalyptic number.

It is an amenable number.

56121121 is a deficient number, since it is larger than the sum of its proper divisors (9162689).

56121121 is a wasteful number, since it uses less digits than its factorization.

56121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145343 (or 1145336 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 56121121 is about 7491.4031395994. The cubic root of 56121121 is about 382.8618666675.

Adding to 56121121 its reverse (12112165), we get a palindrome (68233286).

The spelling of 56121121 in words is "fifty-six million, one hundred twenty-one thousand, one hundred twenty-one".