51521935 has 4 divisors (see below), whose sum is σ = 61826328. Its totient is φ = 41217544.

The previous prime is 51521933. The next prime is 51521941. The reversal of 51521935 is 53912515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51521935 - 2¹ = 51521933 is a prime.

It is a super-2 number, since 2×51521935² = 5309019572288450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51521897 and 51521906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521933) 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, 5152189 + ... + 5152198.

It is an arithmetic number, because the mean of its divisors is an integer number (15456582).

Almost surely, 2^51521935 is an apocalyptic number.

51521935 is a deficient number, since it is larger than the sum of its proper divisors (10304393).

51521935 is a wasteful number, since it uses less digits than its factorization.

51521935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304392.

The product of its digits is 6750, while the sum is 31.

The square root of 51521935 is about 7177.8781683726. The cubic root of 51521935 is about 372.1037571408.

The spelling of 51521935 in words is "fifty-one million, five hundred twenty-one thousand, nine hundred thirty-five".