51015005 has 4 divisors (see below), whose sum is σ = 61218012. Its totient is φ = 40812000.

The previous prime is 51015001. The next prime is 51015007. The reversal of 51015005 is 50051015.

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 36711481 + 14303524 = 6059^2 + 3782^2 .

It is not a de Polignac number, because 51015005 - 2² = 51015001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51015001) 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, 5101496 + ... + 5101505.

It is an arithmetic number, because the mean of its divisors is an integer number (15304503).

Almost surely, 2^51015005 is an apocalyptic number.

It is an amenable number.

51015005 is a deficient number, since it is larger than the sum of its proper divisors (10203007).

51015005 is a wasteful number, since it uses less digits than its factorization.

51015005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203006.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 51015005 is about 7142.4789114144. The cubic root of 51015005 is about 370.8793426341.

The spelling of 51015005 in words is "fifty-one million, fifteen thousand, five".