51913556 has 24 divisors (see below), whose sum is σ = 93819264. Its totient is φ = 25119360.

The previous prime is 51913549. The next prime is 51913559. The reversal of 51913556 is 65531915.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51913559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18101 + ... + 20771.

It is an arithmetic number, because the mean of its divisors is an integer number (3909136).

Almost surely, 2^51913556 is an apocalyptic number.

It is an amenable number.

51913556 is a deficient number, since it is larger than the sum of its proper divisors (41905708).

51913556 is a wasteful number, since it uses less digits than its factorization.

51913556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831 (or 2829 counting only the distinct ones).

The product of its digits is 20250, while the sum is 35.

The square root of 51913556 is about 7205.1062448794. The cubic root of 51913556 is about 373.0441719952.

The spelling of 51913556 in words is "fifty-one million, nine hundred thirteen thousand, five hundred fifty-six".