51804915 has 16 divisors (see below), whose sum is σ = 83350176. Its totient is φ = 27475200.

The previous prime is 51804913. The next prime is 51804953. The reversal of 51804915 is 51940815.

It is not a de Polignac number, because 51804915 - 2¹ = 51804913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51804913) 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, 6826 + ... + 12255.

It is an arithmetic number, because the mean of its divisors is an integer number (5209386).

Almost surely, 2^51804915 is an apocalyptic number.

51804915 is a deficient number, since it is larger than the sum of its proper divisors (31545261).

51804915 is a wasteful number, since it uses less digits than its factorization.

51804915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19270.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 51804915 is about 7197.5631292820. The cubic root of 51804915 is about 372.7837634801.

The spelling of 51804915 in words is "fifty-one million, eight hundred four thousand, nine hundred fifteen".