51272145 has 48 divisors (see below), whose sum is σ = 93085200. Its totient is φ = 26073600.

The previous prime is 51272107. The next prime is 51272149. The reversal of 51272145 is 54127215.

51272145 is a `hidden beast` number, since 512 + 7 + 2 + 145 = 666.

51272145 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 8 ways, for example, as 463761 + 50808384 = 681^2 + 7128^2 .

It is not a de Polignac number, because 51272145 - 2¹⁶ = 51206609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51272149) 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 47 ways as a sum of consecutive naturals, for example, 131611 + ... + 131999.

It is an arithmetic number, because the mean of its divisors is an integer number (1939275).

Almost surely, 2^51272145 is an apocalyptic number.

It is an amenable number.

51272145 is a deficient number, since it is larger than the sum of its proper divisors (41813055).

51272145 is a wasteful number, since it uses less digits than its factorization.

51272145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 527 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 51272145 is about 7160.4570384857. The cubic root of 51272145 is about 371.5014349516.

The spelling of 51272145 in words is "fifty-one million, two hundred seventy-two thousand, one hundred forty-five".