51388099 has 4 divisors (see below), whose sum is σ = 58729264. Its totient is φ = 44046936.

The previous prime is 51388091. The next prime is 51388121. The reversal of 51388099 is 99088315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99088315 = 5 ⋅19817663.

It is a cyclic number.

It is not a de Polignac number, because 51388099 - 2³ = 51388091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51388091) 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 3 ways as a sum of consecutive naturals, for example, 3670572 + ... + 3670585.

It is an arithmetic number, because the mean of its divisors is an integer number (14682316).

Almost surely, 2^51388099 is an apocalyptic number.

51388099 is a deficient number, since it is larger than the sum of its proper divisors (7341165).

51388099 is an equidigital number, since it uses as much as digits as its factorization.

51388099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7341164.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 51388099 is about 7168.5492953596. The cubic root of 51388099 is about 371.7812791998.

The spelling of 51388099 in words is "fifty-one million, three hundred eighty-eight thousand, ninety-nine".