51998215 has 16 divisors (see below), whose sum is σ = 63999360. Its totient is φ = 40538880.

The previous prime is 51998203. The next prime is 51998227. The reversal of 51998215 is 51289915.

51998215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51998203) and next prime (51998227).

It is not a de Polignac number, because 51998215 - 2⁵ = 51998183 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 95845 + ... + 96385.

It is an arithmetic number, because the mean of its divisors is an integer number (3999960).

Almost surely, 2^51998215 is an apocalyptic number.

51998215 is a deficient number, since it is larger than the sum of its proper divisors (12001145).

51998215 is a wasteful number, since it uses less digits than its factorization.

51998215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002.

The product of its digits is 32400, while the sum is 40.

The square root of 51998215 is about 7210.9787823845. The cubic root of 51998215 is about 373.2468447787.

The spelling of 51998215 in words is "fifty-one million, nine hundred ninety-eight thousand, two hundred fifteen".