51445657 has 4 divisors (see below), whose sum is σ = 51460020. Its totient is φ = 51431296.

The previous prime is 51445643. The next prime is 51445661. The reversal of 51445657 is 75654415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11262736 + 40182921 = 3356^2 + 6339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51445657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51445637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3069 + ... + 10597.

It is an arithmetic number, because the mean of its divisors is an integer number (12865005).

Almost surely, 2^51445657 is an apocalyptic number.

It is an amenable number.

51445657 is a deficient number, since it is larger than the sum of its proper divisors (14363).

51445657 is an equidigital number, since it uses as much as digits as its factorization.

51445657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14362.

The product of its digits is 84000, while the sum is 37.

The square root of 51445657 is about 7172.5627916387. The cubic root of 51445657 is about 371.9200337807.

It can be divided in two parts, 5144 and 5657, that added together give a palindrome (10801).

The spelling of 51445657 in words is "fifty-one million, four hundred forty-five thousand, six hundred fifty-seven".