51250005 has 24 divisors (see below), whose sum is σ = 89008920. Its totient is φ = 27279360.

The previous prime is 51249997. The next prime is 51250007. The reversal of 51250005 is 50005215.

It can be written as a sum of positive squares in 4 ways, for example, as 2683044 + 48566961 = 1638^2 + 6969^2 .

It is not a de Polignac number, because 51250005 - 2³ = 51249997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51250005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51250007) 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 23 ways as a sum of consecutive naturals, for example, 33865 + ... + 35345.

It is an arithmetic number, because the mean of its divisors is an integer number (3708705).

Almost surely, 2^51250005 is an apocalyptic number.

It is an amenable number.

51250005 is a deficient number, since it is larger than the sum of its proper divisors (37758915).

51250005 is a wasteful number, since it uses less digits than its factorization.

51250005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 51250005 is about 7158.9108808533. The cubic root of 51250005 is about 371.4479541519.

The spelling of 51250005 in words is "fifty-one million, two hundred fifty thousand, five".