51797749 has 4 divisors (see below), whose sum is σ = 52310700. Its totient is φ = 51284800.

The previous prime is 51797747. The next prime is 51797789. The reversal of 51797749 is 94779715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94779715 = 5 ⋅18955943.

It can be written as a sum of positive squares in 2 ways, for example, as 32376100 + 19421649 = 5690^2 + 4407^2 .

It is a cyclic number.

It is not a de Polignac number, because 51797749 - 2¹ = 51797747 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 (51797747) 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, 256324 + ... + 256525.

It is an arithmetic number, because the mean of its divisors is an integer number (13077675).

Almost surely, 2^51797749 is an apocalyptic number.

It is an amenable number.

51797749 is a deficient number, since it is larger than the sum of its proper divisors (512951).

51797749 is a wasteful number, since it uses less digits than its factorization.

51797749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512950.

The product of its digits is 555660, while the sum is 49.

The square root of 51797749 is about 7197.0653046919. The cubic root of 51797749 is about 372.7665740452.

The spelling of 51797749 in words is "fifty-one million, seven hundred ninety-seven thousand, seven hundred forty-nine".