51521653 has 4 divisors (see below), whose sum is σ = 51863008. Its totient is φ = 51180300.

The previous prime is 51521641. The next prime is 51521689. The reversal of 51521653 is 35612515.

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 a cyclic number.

It is not a de Polignac number, because 51521653 - 2²⁵ = 17967221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170451 + ... + 170752.

It is an arithmetic number, because the mean of its divisors is an integer number (12965752).

Almost surely, 2^51521653 is an apocalyptic number.

It is an amenable number.

51521653 is a deficient number, since it is larger than the sum of its proper divisors (341355).

51521653 is a wasteful number, since it uses less digits than its factorization.

51521653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341354.

The product of its digits is 4500, while the sum is 28.

The square root of 51521653 is about 7177.8585246576. The cubic root of 51521653 is about 372.1030782491.

The spelling of 51521653 in words is "fifty-one million, five hundred twenty-one thousand, six hundred fifty-three".