51851537 has 4 divisors (see below), whose sum is σ = 51866676. Its totient is φ = 51836400.

The previous prime is 51851533. The next prime is 51851557. The reversal of 51851537 is 73515815.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47458321 + 4393216 = 6889^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 51851537 - 2² = 51851533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51851497 and 51851506.

It is not an unprimeable number, because it can be changed into a prime (51851533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287 + ... + 10187.

It is an arithmetic number, because the mean of its divisors is an integer number (12966669).

Almost surely, 2^51851537 is an apocalyptic number.

It is an amenable number.

51851537 is a deficient number, since it is larger than the sum of its proper divisors (15139).

51851537 is an equidigital number, since it uses as much as digits as its factorization.

51851537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15138.

The product of its digits is 21000, while the sum is 35.

The square root of 51851537 is about 7200.8011359848. The cubic root of 51851537 is about 372.8955592657.

The spelling of 51851537 in words is "fifty-one million, eight hundred fifty-one thousand, five hundred thirty-seven".