51654921 has 8 divisors (see below), whose sum is σ = 69051840. Its totient is φ = 34347312.

The previous prime is 51654917. The next prime is 51654929. The reversal of 51654921 is 12945615.

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

It is not a de Polignac number, because 51654921 - 2² = 51654917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51654929) 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, 20965 + ... + 23298.

It is an arithmetic number, because the mean of its divisors is an integer number (8631480).

Almost surely, 2^51654921 is an apocalyptic number.

It is an amenable number.

51654921 is a deficient number, since it is larger than the sum of its proper divisors (17396919).

51654921 is a wasteful number, since it uses less digits than its factorization.

51654921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44655.

The product of its digits is 10800, while the sum is 33.

The square root of 51654921 is about 7187.1357994684. The cubic root of 51654921 is about 372.4236343312.

The spelling of 51654921 in words is "fifty-one million, six hundred fifty-four thousand, nine hundred twenty-one".