51998135 has 16 divisors (see below), whose sum is σ = 73240896. Its totient is φ = 34691328.

The previous prime is 51998113. The next prime is 51998143. The reversal of 51998135 is 53189915.

It is not a de Polignac number, because 51998135 - 2¹⁰ = 51997111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51998092 and 51998101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18782 + ... + 21371.

It is an arithmetic number, because the mean of its divisors is an integer number (4577556).

Almost surely, 2^51998135 is an apocalyptic number.

51998135 is a deficient number, since it is larger than the sum of its proper divisors (21242761).

51998135 is a wasteful number, since it uses less digits than its factorization.

51998135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40202.

The product of its digits is 48600, while the sum is 41.

The square root of 51998135 is about 7210.9732352852. The cubic root of 51998135 is about 373.2466533634.

The spelling of 51998135 in words is "fifty-one million, nine hundred ninety-eight thousand, one hundred thirty-five".