51500515 has 16 divisors (see below), whose sum is σ = 68080896. Its totient is φ = 37087200.

The previous prime is 51500503. The next prime is 51500539.

51500515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51500515 - 2¹⁵ = 51467747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1120 + ... + 10210.

It is an arithmetic number, because the mean of its divisors is an integer number (4255056).

Almost surely, 2^51500515 is an apocalyptic number.

51500515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51500515 is a deficient number, since it is larger than the sum of its proper divisors (16580381).

51500515 is a wasteful number, since it uses less digits than its factorization.

51500515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210.

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

The square root of 51500515 is about 7176.3859288642. The cubic root of 51500515 is about 372.0521832025.

It can be divided in two parts, 51500 and 515, that multiplied together give a square (26522500 = 5150²).

The spelling of 51500515 in words is "fifty-one million, five hundred thousand, five hundred fifteen".