51772121 has 4 divisors (see below), whose sum is σ = 51797172. Its totient is φ = 51747072.

The previous prime is 51772067. The next prime is 51772181. The reversal of 51772121 is 12127715.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46389721 + 5382400 = 6811^2 + 2320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51772121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51772181) 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, 9116 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (12949293).

Almost surely, 2^51772121 is an apocalyptic number.

It is an amenable number.

51772121 is a deficient number, since it is larger than the sum of its proper divisors (25051).

51772121 is a wasteful number, since it uses less digits than its factorization.

51772121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25050.

The product of its digits is 980, while the sum is 26.

The square root of 51772121 is about 7195.2846364824. The cubic root of 51772121 is about 372.7050859308.

Adding to 51772121 its reverse (12127715), we get a palindrome (63899836).

The spelling of 51772121 in words is "fifty-one million, seven hundred seventy-two thousand, one hundred twenty-one".