51521535 has 64 divisors (see below), whose sum is σ = 101928960. Its totient is φ = 24520320.

The previous prime is 51521513. The next prime is 51521537. The reversal of 51521535 is 53512515.

It is not a de Polignac number, because 51521535 - 2⁶ = 51521471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51521499 and 51521508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521537) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53932 + ... + 54878.

It is an arithmetic number, because the mean of its divisors is an integer number (1592640).

Almost surely, 2^51521535 is an apocalyptic number.

51521535 is a deficient number, since it is larger than the sum of its proper divisors (50407425).

51521535 is a wasteful number, since it uses less digits than its factorization.

51521535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 999 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 51521535 is about 7177.8503049311. The cubic root of 51521535 is about 372.1027941731.

The spelling of 51521535 in words is "fifty-one million, five hundred twenty-one thousand, five hundred thirty-five".