51775321 has 8 divisors (see below), whose sum is σ = 57265544. Its totient is φ = 46500480.

The previous prime is 51775309. The next prime is 51775337. The reversal of 51775321 is 12357715.

It can be written as a sum of positive squares in 4 ways, for example, as 3667225 + 48108096 = 1915^2 + 6936^2 .

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

It is not a de Polignac number, because 51775321 - 2⁵ = 51775289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51773321) 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, 53340 + ... + 54301.

It is an arithmetic number, because the mean of its divisors is an integer number (7158193).

Almost surely, 2^51775321 is an apocalyptic number.

It is an amenable number.

51775321 is a deficient number, since it is larger than the sum of its proper divisors (5490223).

51775321 is a wasteful number, since it uses less digits than its factorization.

51775321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107691.

The product of its digits is 7350, while the sum is 31.

The square root of 51775321 is about 7195.5070008999. The cubic root of 51775321 is about 372.7127646562.

The spelling of 51775321 in words is "fifty-one million, seven hundred seventy-five thousand, three hundred twenty-one".