51550915 has 12 divisors (see below), whose sum is σ = 66986784. Its totient is φ = 38067744.

The previous prime is 51550913. The next prime is 51550931. The reversal of 51550915 is 51905515.

It is not a de Polignac number, because 51550915 - 2¹ = 51550913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51550913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29659 + ... + 31348.

It is an arithmetic number, because the mean of its divisors is an integer number (5582232).

Almost surely, 2^51550915 is an apocalyptic number.

51550915 is a deficient number, since it is larger than the sum of its proper divisors (15435869).

51550915 is a wasteful number, since it uses less digits than its factorization.

51550915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61038 (or 61025 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 31.

The square root of 51550915 is about 7179.8965869990. The cubic root of 51550915 is about 372.1735108983.

It can be divided in two parts, 515509 and 15, that added together give a square (515524 = 718²).

The spelling of 51550915 in words is "fifty-one million, five hundred fifty thousand, nine hundred fifteen".