51551881 has 8 divisors (see below), whose sum is σ = 53161920. Its totient is φ = 49965552.

The previous prime is 51551873. The next prime is 51551891. The reversal of 51551881 is 18815515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51551881 - 2³ = 51551873 is a prime.

It is a super-2 number, since 2×51551881² = 5315192869276322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51551861) 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, 1461 + ... + 10258.

It is an arithmetic number, because the mean of its divisors is an integer number (6645240).

Almost surely, 2^51551881 is an apocalyptic number.

It is an amenable number.

51551881 is a deficient number, since it is larger than the sum of its proper divisors (1610039).

51551881 is a wasteful number, since it uses less digits than its factorization.

51551881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11855.

The product of its digits is 8000, while the sum is 34.

The square root of 51551881 is about 7179.9638578478. The cubic root of 51551881 is about 372.1758355733.

The spelling of 51551881 in words is "fifty-one million, five hundred fifty-one thousand, eight hundred eighty-one".