51315337 has 4 divisors (see below), whose sum is σ = 52702276. Its totient is φ = 49928400.

The previous prime is 51315317. The next prime is 51315359. The reversal of 51315337 is 73351315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41100921 + 10214416 = 6411^2 + 3196^2 .

It is a cyclic number.

It is not a de Polignac number, because 51315337 - 2¹¹ = 51313289 is a prime.

It is a super-2 number, since 2×51315337² = 5266527622847138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51315317) 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, 693414 + ... + 693487.

It is an arithmetic number, because the mean of its divisors is an integer number (13175569).

Almost surely, 2^51315337 is an apocalyptic number.

It is an amenable number.

51315337 is a deficient number, since it is larger than the sum of its proper divisors (1386939).

51315337 is a wasteful number, since it uses less digits than its factorization.

51315337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386938.

The product of its digits is 4725, while the sum is 28.

The square root of 51315337 is about 7163.4724121755. The cubic root of 51315337 is about 371.6057241088.

The spelling of 51315337 in words is "fifty-one million, three hundred fifteen thousand, three hundred thirty-seven".