51899526 has 108 divisors (see below), whose sum is σ = 138901932. Its totient is φ = 13961808.

The previous prime is 51899513. The next prime is 51899539. The reversal of 51899526 is 62599815.

It is an interprime number because it is at equal distance from previous prime (51899513) and next prime (51899539).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 318321 + ... + 318483.

It is an arithmetic number, because the mean of its divisors is an integer number (1286129).

It is a vampire number, since it can be written as 5586 ⋅ 9291 (with its own digits).

Almost surely, 2^51899526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51899526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69450966).

51899526 is an abundant number, since it is smaller than the sum of its proper divisors (87002406).

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

51899526 is a wasteful number, since it uses less digits than its factorization.

51899526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 194 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 51899526 is about 7204.1325640218. The cubic root of 51899526 is about 373.0105630390.

It can be divided in two parts, 51899 and 526, that added together give a palindrome (52425).

The spelling of 51899526 in words is "fifty-one million, eight hundred ninety-nine thousand, five hundred twenty-six".