51249505 has 8 divisors (see below), whose sum is σ = 62808192. Its totient is φ = 40127088.

The previous prime is 51249503. The next prime is 51249529. The reversal of 51249505 is 50594215.

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 51249505 - 2¹ = 51249503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51249503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108807 + ... + 109276.

It is an arithmetic number, because the mean of its divisors is an integer number (7851024).

Almost surely, 2^51249505 is an apocalyptic number.

It is an amenable number.

51249505 is a deficient number, since it is larger than the sum of its proper divisors (11558687).

51249505 is a wasteful number, since it uses less digits than its factorization.

51249505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218135.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 51249505 is about 7158.8759592551. The cubic root of 51249505 is about 371.4467461873.

The spelling of 51249505 in words is "fifty-one million, two hundred forty-nine thousand, five hundred five".