51444397 has 8 divisors (see below), whose sum is σ = 55499256. Its totient is φ = 47503872.

The previous prime is 51444389. The next prime is 51444413. The reversal of 51444397 is 79344415.

It can be written as a sum of positive squares in 4 ways, for example, as 5597956 + 45846441 = 2366^2 + 6771^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51444397 - 2³ = 51444389 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 (51444377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27648 + ... + 29449.

It is an arithmetic number, because the mean of its divisors is an integer number (6937407).

Almost surely, 2^51444397 is an apocalyptic number.

It is an amenable number.

51444397 is a deficient number, since it is larger than the sum of its proper divisors (4054859).

51444397 is a wasteful number, since it uses less digits than its factorization.

51444397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57167.

The product of its digits is 60480, while the sum is 37.

The square root of 51444397 is about 7172.4749563871. The cubic root of 51444397 is about 371.9169974177.

The spelling of 51444397 in words is "fifty-one million, four hundred forty-four thousand, three hundred ninety-seven".