51801517 has 8 divisors (see below), whose sum is σ = 53293176. Its totient is φ = 50314752.

The previous prime is 51801509. The next prime is 51801523. The reversal of 51801517 is 71510815.

It can be written as a sum of positive squares in 4 ways, for example, as 39614436 + 12187081 = 6294^2 + 3491^2 .

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 51801517 - 2³ = 51801509 is a prime.

It is a Duffinian number.

51801517 is a modest number, since divided by 1517 gives 518 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51801817) 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, 35433 + ... + 36865.

It is an arithmetic number, because the mean of its divisors is an integer number (6661647).

Almost surely, 2^51801517 is an apocalyptic number.

It is an amenable number.

51801517 is a deficient number, since it is larger than the sum of its proper divisors (1491659).

51801517 is a wasteful number, since it uses less digits than its factorization.

51801517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 51801517 is about 7197.3270732960. The cubic root of 51801517 is about 372.7756127288.

The spelling of 51801517 in words is "fifty-one million, eight hundred one thousand, five hundred seventeen".