51289121 has 8 divisors (see below), whose sum is σ = 55290984. Its totient is φ = 47295360.

The previous prime is 51289099. The next prime is 51289127. The reversal of 51289121 is 12198215.

It can be written as a sum of positive squares in 4 ways, for example, as 3748096 + 47541025 = 1936^2 + 6895^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51289121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51289127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20351 + ... + 22731.

It is an arithmetic number, because the mean of its divisors is an integer number (6911373).

Almost surely, 2^51289121 is an apocalyptic number.

It is an amenable number.

51289121 is a deficient number, since it is larger than the sum of its proper divisors (4001863).

51289121 is a wasteful number, since it uses less digits than its factorization.

51289121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

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

The square root of 51289121 is about 7161.6423395755. The cubic root of 51289121 is about 371.5424313020.

The spelling of 51289121 in words is "fifty-one million, two hundred eighty-nine thousand, one hundred twenty-one".