51800693 has 6 divisors (see below), whose sum is σ = 60258006. Its totient is φ = 44400552.

The previous prime is 51800689. The next prime is 51800731. The reversal of 51800693 is 39600815.

It can be written as a sum of positive squares in only one way, i.e., 48121969 + 3678724 = 6937^2 + 1918^2 .

It is not a de Polignac number, because 51800693 - 2² = 51800689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51800093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 528530 + ... + 528627.

It is an arithmetic number, because the mean of its divisors is an integer number (10043001).

Almost surely, 2^51800693 is an apocalyptic number.

It is an amenable number.

51800693 is a deficient number, since it is larger than the sum of its proper divisors (8457313).

51800693 is a wasteful number, since it uses less digits than its factorization.

51800693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057171 (or 1057164 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 51800693 is about 7197.2698295951. The cubic root of 51800693 is about 372.7736361539.

The spelling of 51800693 in words is "fifty-one million, eight hundred thousand, six hundred ninety-three".