51591616 has 28 divisors (see below), whose sum is σ = 105148888. Its totient is φ = 25097472.

The previous prime is 51591611. The next prime is 51591637. The reversal of 51591616 is 61619515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51591611) 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, 8526 + ... + 13261.

Almost surely, 2^51591616 is an apocalyptic number.

It is an amenable number.

51591616 is an abundant number, since it is smaller than the sum of its proper divisors (53557272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51591616 is a wasteful number, since it uses less digits than its factorization.

51591616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21836 (or 21826 counting only the distinct ones).

The product of its digits is 8100, while the sum is 34.

The square root of 51591616 is about 7182.7304000638. The cubic root of 51591616 is about 372.2714325308.

The spelling of 51591616 in words is "fifty-one million, five hundred ninety-one thousand, six hundred sixteen".