51564121 has 6 divisors (see below), whose sum is σ = 59982810. Its totient is φ = 44197776.

The previous prime is 51564113. The next prime is 51564127. The reversal of 51564121 is 12146515.

It is a happy number.

51564121 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., 45630025 + 5934096 = 6755^2 + 2436^2 .

It is not a de Polignac number, because 51564121 - 2³ = 51564113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51564127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 526116 + ... + 526213.

It is an arithmetic number, because the mean of its divisors is an integer number (9997135).

Almost surely, 2^51564121 is an apocalyptic number.

It is an amenable number.

51564121 is a deficient number, since it is larger than the sum of its proper divisors (8418689).

51564121 is a wasteful number, since it uses less digits than its factorization.

51564121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052343 (or 1052336 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 51564121 is about 7180.8161792376. The cubic root of 51564121 is about 372.2052885674.

The spelling of 51564121 in words is "fifty-one million, five hundred sixty-four thousand, one hundred twenty-one".