51921080 has 16 divisors (see below), whose sum is σ = 116822520. Its totient is φ = 20768416.

The previous prime is 51921073. The next prime is 51921083. The reversal of 51921080 is 8012915.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51921083) 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, 648974 + ... + 649053.

Almost surely, 2^51921080 is an apocalyptic number.

It is an amenable number.

51921080 is an abundant number, since it is smaller than the sum of its proper divisors (64901440).

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

51921080 is a wasteful number, since it uses less digits than its factorization.

51921080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298038 (or 1298034 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 51921080 is about 7205.6283556675. The cubic root of 51921080 is about 373.0621932917.

Adding to 51921080 its reverse (8012915), we get a palindrome (59933995).

The spelling of 51921080 in words is "fifty-one million, nine hundred twenty-one thousand, eighty".