51915893 has 4 divisors (see below), whose sum is σ = 51993708. Its totient is φ = 51838080.

The previous prime is 51915883. The next prime is 51915947. The reversal of 51915893 is 39851915.

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 18472804 + 33443089 = 4298^2 + 5783^2 .

It is a cyclic number.

It is not a de Polignac number, because 51915893 - 2¹⁰ = 51914869 is a prime.

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 51915893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51915833) 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, 37898 + ... + 39243.

It is an arithmetic number, because the mean of its divisors is an integer number (12998427).

Almost surely, 2^51915893 is an apocalyptic number.

It is an amenable number.

51915893 is a deficient number, since it is larger than the sum of its proper divisors (77815).

51915893 is an equidigital number, since it uses as much as digits as its factorization.

51915893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77814.

The product of its digits is 48600, while the sum is 41.

The square root of 51915893 is about 7205.2684197051. The cubic root of 51915893 is about 373.0497697055.

The spelling of 51915893 in words is "fifty-one million, nine hundred fifteen thousand, eight hundred ninety-three".