51553505 has 4 divisors (see below), whose sum is σ = 61864212. Its totient is φ = 41242800.

The previous prime is 51553499. The next prime is 51553507. The reversal of 51553505 is 50535515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50535515 = 5 ⋅10107103.

It can be written as a sum of positive squares in 2 ways, for example, as 7623121 + 43930384 = 2761^2 + 6628^2 .

It is not a de Polignac number, because 51553505 - 2¹⁰ = 51552481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51553507) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5155346 + ... + 5155355.

It is an arithmetic number, because the mean of its divisors is an integer number (15466053).

Almost surely, 2^51553505 is an apocalyptic number.

It is an amenable number.

51553505 is a deficient number, since it is larger than the sum of its proper divisors (10310707).

51553505 is a wasteful number, since it uses less digits than its factorization.

51553505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310706.

The product of its (nonzero) digits is 9375, while the sum is 29.

The square root of 51553505 is about 7180.0769494484. The cubic root of 51553505 is about 372.1797436570.

The spelling of 51553505 in words is "fifty-one million, five hundred fifty-three thousand, five hundred five".