51809956 has 12 divisors (see below), whose sum is σ = 98910000. Its totient is φ = 23549960.

The previous prime is 51809929. The next prime is 51809971. The reversal of 51809956 is 65990815.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588706 + ... + 588793.

It is an arithmetic number, because the mean of its divisors is an integer number (8242500).

Almost surely, 2^51809956 is an apocalyptic number.

It is an amenable number.

51809956 is a deficient number, since it is larger than the sum of its proper divisors (47100044).

51809956 is a wasteful number, since it uses less digits than its factorization.

51809956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177514 (or 1177512 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 51809956 is about 7197.9133087305. The cubic root of 51809956 is about 372.7958546237.

The spelling of 51809956 in words is "fifty-one million, eight hundred nine thousand, nine hundred fifty-six".