51855409 has 8 divisors (see below), whose sum is σ = 54205632. Its totient is φ = 49513200.

The previous prime is 51855407. The next prime is 51855413. The reversal of 51855409 is 90455815.

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 51855409 - 2¹ = 51855407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51855407) 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, 14059 + ... + 17359.

It is an arithmetic number, because the mean of its divisors is an integer number (6775704).

Almost surely, 2^51855409 is an apocalyptic number.

It is an amenable number.

51855409 is a deficient number, since it is larger than the sum of its proper divisors (2350223).

51855409 is a wasteful number, since it uses less digits than its factorization.

51855409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 51855409 is about 7201.0699899390. The cubic root of 51855409 is about 372.9048409942.

The spelling of 51855409 in words is "fifty-one million, eight hundred fifty-five thousand, four hundred nine".