51105551 has 8 divisors (see below), whose sum is σ = 58466304. Its totient is φ = 43759800.

The previous prime is 51105539. The next prime is 51105559. The reversal of 51105551 is 15550115.

It is a happy number.

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

It is not a de Polignac number, because 51105551 - 2⁶ = 51105487 is a prime.

It is a super-2 number, since 2×51105551² = 5223554686027202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51105559) 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, 4886 + ... + 11228.

It is an arithmetic number, because the mean of its divisors is an integer number (7308288).

Almost surely, 2^51105551 is an apocalyptic number.

51105551 is a deficient number, since it is larger than the sum of its proper divisors (7360753).

51105551 is a wasteful number, since it uses less digits than its factorization.

51105551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7501.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 51105551 is about 7148.8146569903. The cubic root of 51105551 is about 371.0986362362.

Adding to 51105551 its reverse (15550115), we get a palindrome (66655666).

The spelling of 51105551 in words is "fifty-one million, one hundred five thousand, five hundred fifty-one".