51206745 has 32 divisors (see below), whose sum is σ = 85567104. Its totient is φ = 26124800.

The previous prime is 51206711. The next prime is 51206777. The reversal of 51206745 is 54760215.

51206745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51206745 - 2¹² = 51202649 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 31810 + ... + 33380.

It is an arithmetic number, because the mean of its divisors is an integer number (2673972).

Almost surely, 2^51206745 is an apocalyptic number.

It is an amenable number.

51206745 is a deficient number, since it is larger than the sum of its proper divisors (34360359).

51206745 is a wasteful number, since it uses less digits than its factorization.

51206745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 51206745 is about 7155.8888336810. Note that the first 4 decimals coincide. The cubic root of 51206745 is about 371.3434119713.

The spelling of 51206745 in words is "fifty-one million, two hundred six thousand, seven hundred forty-five".