51002005 has 8 divisors (see below), whose sum is σ = 61977600. Its totient is φ = 40284816.

The previous prime is 51001997. The next prime is 51002011. The reversal of 51002005 is 50020015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51002005 - 2³ = 51001997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64165 + ... + 64954.

It is an arithmetic number, because the mean of its divisors is an integer number (7747200).

Almost surely, 2^51002005 is an apocalyptic number.

It is an amenable number.

51002005 is a deficient number, since it is larger than the sum of its proper divisors (10975595).

51002005 is a wasteful number, since it uses less digits than its factorization.

51002005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129203.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 51002005 is about 7141.5688052416. The cubic root of 51002005 is about 370.8478366026.

The spelling of 51002005 in words is "fifty-one million, two thousand, five".