51031573 has 4 divisors (see below), whose sum is σ = 51183340. Its totient is φ = 50879808.

The previous prime is 51031559. The next prime is 51031577. The reversal of 51031573 is 37513015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37513015 = 5 ⋅7502603.

It can be written as a sum of positive squares in 2 ways, for example, as 12802084 + 38229489 = 3578^2 + 6183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51031573 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 (51031577) 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, 75378 + ... + 76051.

It is an arithmetic number, because the mean of its divisors is an integer number (12795835).

Almost surely, 2^51031573 is an apocalyptic number.

It is an amenable number.

51031573 is a deficient number, since it is larger than the sum of its proper divisors (151767).

51031573 is a wasteful number, since it uses less digits than its factorization.

51031573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151766.

The product of its (nonzero) digits is 1575, while the sum is 25.

The square root of 51031573 is about 7143.6386386771. The cubic root of 51031573 is about 370.9194881028.

Adding to 51031573 its reverse (37513015), we get a palindrome (88544588).

The spelling of 51031573 in words is "fifty-one million, thirty-one thousand, five hundred seventy-three".