51911505 has 12 divisors (see below), whose sum is σ = 89980020. Its totient is φ = 27686112.

The previous prime is 51911491. The next prime is 51911521. The reversal of 51911505 is 50511915.

It can be written as a sum of positive squares in 2 ways, for example, as 33558849 + 18352656 = 5793^2 + 4284^2 .

It is not a de Polignac number, because 51911505 - 2⁵ = 51911473 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 576750 + ... + 576839.

It is an arithmetic number, because the mean of its divisors is an integer number (7498335).

Almost surely, 2^51911505 is an apocalyptic number.

It is an amenable number.

51911505 is a deficient number, since it is larger than the sum of its proper divisors (38068515).

51911505 is a wasteful number, since it uses less digits than its factorization.

51911505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153600 (or 1153597 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 27.

The square root of 51911505 is about 7204.9639138583. The cubic root of 51911505 is about 373.0392591893.

The spelling of 51911505 in words is "fifty-one million, nine hundred eleven thousand, five hundred five".