51320115 has 64 divisors (see below), whose sum is σ = 113771520. Its totient is φ = 21323520.

The previous prime is 51320077. The next prime is 51320117. The reversal of 51320115 is 51102315.

51320115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51320115 - 2⁸ = 51319859 is a prime.

It is a super-2 number, since 2×51320115² = 5267508407226450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51320117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7927 + ... + 12863.

It is an arithmetic number, because the mean of its divisors is an integer number (1777680).

Almost surely, 2^51320115 is an apocalyptic number.

51320115 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51320115 is an abundant number, since it is smaller than the sum of its proper divisors (62451405).

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

51320115 is a wasteful number, since it uses less digits than its factorization.

51320115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4969 (or 4963 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51320115 is about 7163.8059018932. The cubic root of 51320115 is about 371.6172572238.

The spelling of 51320115 in words is "fifty-one million, three hundred twenty thousand, one hundred fifteen".