51372005 has 4 divisors (see below), whose sum is σ = 61646412. Its totient is φ = 41097600.

The previous prime is 51371993. The next prime is 51372007. The reversal of 51372005 is 50027315.

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 19483396 + 31888609 = 4414^2 + 5647^2 .

It is not a de Polignac number, because 51372005 - 2⁶ = 51371941 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 (51372007) 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, 5137196 + ... + 5137205.

It is an arithmetic number, because the mean of its divisors is an integer number (15411603).

Almost surely, 2^51372005 is an apocalyptic number.

It is an amenable number.

51372005 is a deficient number, since it is larger than the sum of its proper divisors (10274407).

51372005 is a wasteful number, since it uses less digits than its factorization.

51372005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10274406.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 51372005 is about 7167.4266651288. The cubic root of 51372005 is about 371.7424629968.

The spelling of 51372005 in words is "fifty-one million, three hundred seventy-two thousand, five".