51989016121 has 9 divisors (see below), whose sum is σ = 60478875471. Its totient is φ = 44560645752.

The previous prime is 51989016071. The next prime is 51989016127. The reversal of 51989016121 is 12161098915.

The square root of 51989016121 is 228011.

It is a perfect power (a square), and thus also a powerful number.

51989016121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 385533225 + 51603482896 = 19635^2 + 227164^2 .

It is not a de Polignac number, because 51989016121 - 2²³ = 51980627513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51989016127) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1579791 + ... + 1612363.

Almost surely, 2^51989016121 is an apocalyptic number.

51989016121 is the 228011-st square number.

51989016121 is the 114006-th centered octagonal number.

It is an amenable number.

51989016121 is a deficient number, since it is larger than the sum of its proper divisors (8489859350).

51989016121 is an frugal number, since it uses more digits than its factorization.

51989016121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65160 (or 32580 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 43.

The spelling of 51989016121 in words is "fifty-one billion, nine hundred eighty-nine million, sixteen thousand, one hundred twenty-one".