51921036 has 18 divisors (see below), whose sum is σ = 131244932. Its totient is φ = 17307000.

The previous prime is 51921019. The next prime is 51921059. The reversal of 51921036 is 63012915.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 721090 + ... + 721161.

Almost surely, 2^51921036 is an apocalyptic number.

It is an amenable number.

51921036 is an abundant number, since it is smaller than the sum of its proper divisors (79323896).

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

51921036 is a wasteful number, since it uses less digits than its factorization.

51921036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442261 (or 1442256 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 51921036 is about 7205.6253024980. The cubic root of 51921036 is about 373.0620879091.

The spelling of 51921036 in words is "fifty-one million, nine hundred twenty-one thousand, thirty-six".