51005558 has 8 divisors (see below), whose sum is σ = 78374520. Its totient is φ = 24880720.

The previous prime is 51005551. The next prime is 51005561. The reversal of 51005558 is 85550015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×51005558³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51005558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005551) 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, 310928 + ... + 311091.

It is an arithmetic number, because the mean of its divisors is an integer number (9796815).

Almost surely, 2^51005558 is an apocalyptic number.

51005558 is a deficient number, since it is larger than the sum of its proper divisors (27368962).

51005558 is a wasteful number, since it uses less digits than its factorization.

51005558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622062.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 51005558 is about 7141.8175557767. The cubic root of 51005558 is about 370.8564479750.

The spelling of 51005558 in words is "fifty-one million, five thousand, five hundred fifty-eight".