51851837 has 4 divisors (see below), whose sum is σ = 53253276. Its totient is φ = 50450400.

The previous prime is 51851803. The next prime is 51851869. The reversal of 51851837 is 73815815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73815815 = 5 ⋅14763163.

It can be written as a sum of positive squares in 2 ways, for example, as 37871716 + 13980121 = 6154^2 + 3739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51851837 is a prime.

It is a super-2 number, since 2×51851837² = 5377226000549138, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 51851837 parts by 10183 straight cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51851837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51850837) 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, 700664 + ... + 700737.

It is an arithmetic number, because the mean of its divisors is an integer number (13313319).

Almost surely, 2^51851837 is an apocalyptic number.

It is an amenable number.

51851837 is a deficient number, since it is larger than the sum of its proper divisors (1401439).

51851837 is a wasteful number, since it uses less digits than its factorization.

51851837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401438.

The product of its digits is 33600, while the sum is 38.

The square root of 51851837 is about 7200.8219669702. The cubic root of 51851837 is about 372.8962784244.

The spelling of 51851837 in words is "fifty-one million, eight hundred fifty-one thousand, eight hundred thirty-seven".