51002405 has 8 divisors (see below), whose sum is σ = 62206584. Its totient is φ = 40132800.

The previous prime is 51002383. The next prime is 51002423. The reversal of 51002405 is 50420015.

It can be written as a sum of positive squares in 4 ways, for example, as 293764 + 50708641 = 542^2 + 7121^2 .

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

It is not a de Polignac number, because 51002405 - 2¹⁰ = 51001381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83306 + ... + 83915.

It is an arithmetic number, because the mean of its divisors is an integer number (7775823).

Almost surely, 2^51002405 is an apocalyptic number.

It is an amenable number.

51002405 is a deficient number, since it is larger than the sum of its proper divisors (11204179).

51002405 is a wasteful number, since it uses less digits than its factorization.

51002405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167287.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 51002405 is about 7141.5968102379. The cubic root of 51002405 is about 370.8488060988.

The spelling of 51002405 in words is "fifty-one million, two thousand, four hundred five".