51945757 has 8 divisors (see below), whose sum is σ = 54021240. Its totient is φ = 49889280.

The previous prime is 51945701. The next prime is 51945767. The reversal of 51945757 is 75754915.

It can be written as a sum of positive squares in 4 ways, for example, as 11737476 + 40208281 = 3426^2 + 6341^2 .

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

It is not a de Polignac number, because 51945757 - 2⁷ = 51945629 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 (51945767) 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, 957 + ... + 10237.

It is an arithmetic number, because the mean of its divisors is an integer number (6752655).

Almost surely, 2^51945757 is an apocalyptic number.

It is an amenable number.

51945757 is a deficient number, since it is larger than the sum of its proper divisors (2075483).

51945757 is a wasteful number, since it uses less digits than its factorization.

51945757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9503.

The product of its digits is 220500, while the sum is 43.

The square root of 51945757 is about 7207.3404942461. The cubic root of 51945757 is about 373.1212868086.

The spelling of 51945757 in words is "fifty-one million, nine hundred forty-five thousand, seven hundred fifty-seven".