51550015 has 16 divisors (see below), whose sum is σ = 70419456. Its totient is φ = 35860000.

The previous prime is 51550013. The next prime is 51550019. The reversal of 51550015 is 51005515.

51550015 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 51550015 - 2¹ = 51550013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19111 + ... + 21640.

It is an arithmetic number, because the mean of its divisors is an integer number (4401216).

Almost surely, 2^51550015 is an apocalyptic number.

51550015 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51550015 is a deficient number, since it is larger than the sum of its proper divisors (18869441).

51550015 is a wasteful number, since it uses less digits than its factorization.

51550015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40790.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 51550015 is about 7179.8339117280. The cubic root of 51550015 is about 372.1713450259.

It can be divided in two parts, 515500 and 15, that added together give a palindrome (515515).

The spelling of 51550015 in words is "fifty-one million, five hundred fifty thousand, fifteen".