51555553 has 8 divisors (see below), whose sum is σ = 59887040. Its totient is φ = 43465680.

The previous prime is 51555521. The next prime is 51555571. The reversal of 51555553 is 35555515.

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 51555553 - 2⁵ = 51555521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555253) 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, 59943 + ... + 60796.

It is an arithmetic number, because the mean of its divisors is an integer number (7485880).

Almost surely, 2^51555553 is an apocalyptic number.

It is an amenable number.

51555553 is a deficient number, since it is larger than the sum of its proper divisors (8331487).

51555553 is a wasteful number, since it uses less digits than its factorization.

51555553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120807.

The product of its digits is 46875, while the sum is 34.

The square root of 51555553 is about 7180.2195648880. The cubic root of 51555553 is about 372.1846719610.

The spelling of 51555553 in words is "fifty-one million, five hundred fifty-five thousand, five hundred fifty-three".