51898521 has 8 divisors (see below), whose sum is σ = 69443680. Its totient is φ = 34476192.

The previous prime is 51898513. The next prime is 51898523. The reversal of 51898521 is 12589815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51898521 - 2³ = 51898513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51898521.

It is not an unprimeable number, because it can be changed into a prime (51898523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29716 + ... + 31413.

It is an arithmetic number, because the mean of its divisors is an integer number (8680460).

Almost surely, 2^51898521 is an apocalyptic number.

It is an amenable number.

51898521 is a deficient number, since it is larger than the sum of its proper divisors (17545159).

51898521 is a wasteful number, since it uses less digits than its factorization.

51898521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61415.

The product of its digits is 28800, while the sum is 39.

The square root of 51898521 is about 7204.0628120527. The cubic root of 51898521 is about 373.0081553225.

The spelling of 51898521 in words is "fifty-one million, eight hundred ninety-eight thousand, five hundred twenty-one".