51551553 has 8 divisors (see below), whose sum is σ = 68816448. Its totient is φ = 34327184.

The previous prime is 51551537. The next prime is 51551557. The reversal of 51551553 is 35515515.

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 51551553 - 2⁴ = 51551537 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51551553.

It is not an unprimeable number, because it can be changed into a prime (51551557) 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 7 ways as a sum of consecutive naturals, for example, 7026 + ... + 12347.

It is an arithmetic number, because the mean of its divisors is an integer number (8602056).

Almost surely, 2^51551553 is an apocalyptic number.

It is an amenable number.

51551553 is a deficient number, since it is larger than the sum of its proper divisors (17264895).

51551553 is a wasteful number, since it uses less digits than its factorization.

51551553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20263.

The product of its digits is 9375, while the sum is 30.

The square root of 51551553 is about 7179.9410164708. The cubic root of 51551553 is about 372.1750462459.

The spelling of 51551553 in words is "fifty-one million, five hundred fifty-one thousand, five hundred fifty-three".