51155316 has 18 divisors (see below), whose sum is σ = 129309362. Its totient is φ = 17051760.

The previous prime is 51155311. The next prime is 51155347. The reversal of 51155316 is 61355115.

It can be written as a sum of positive squares in only one way, i.e., 51065316 + 90000 = 7146^2 + 300^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 51155316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710455 + ... + 710526.

Almost surely, 2^51155316 is an apocalyptic number.

It is an amenable number.

51155316 is an abundant number, since it is smaller than the sum of its proper divisors (78154046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51155316 is a wasteful number, since it uses less digits than its factorization.

51155316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420991 (or 1420986 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 51155316 is about 7152.2944570257. The cubic root of 51155316 is about 371.2190519384.

The spelling of 51155316 in words is "fifty-one million, one hundred fifty-five thousand, three hundred sixteen".