51525921 has 4 divisors (see below), whose sum is σ = 68701232. Its totient is φ = 34350612.

The previous prime is 51525917. The next prime is 51525923. The reversal of 51525921 is 12952515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51525921 - 2² = 51525917 is a prime.

It is a super-3 number, since 3×51525921³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51525923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8587651 + ... + 8587656.

It is an arithmetic number, because the mean of its divisors is an integer number (17175308).

Almost surely, 2^51525921 is an apocalyptic number.

It is an amenable number.

51525921 is a deficient number, since it is larger than the sum of its proper divisors (17175311).

51525921 is a wasteful number, since it uses less digits than its factorization.

51525921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17175310.

The product of its digits is 4500, while the sum is 30.

The square root of 51525921 is about 7178.1558216578. The cubic root of 51525921 is about 372.1133528424.

The spelling of 51525921 in words is "fifty-one million, five hundred twenty-five thousand, nine hundred twenty-one".