51221255 has 8 divisors (see below), whose sum is σ = 65081232. Its totient is φ = 38566528.

The previous prime is 51221243. The next prime is 51221281. The reversal of 51221255 is 55212215.

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 51221255 - 2⁴ = 51221239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51221255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301217 + ... + 301386.

It is an arithmetic number, because the mean of its divisors is an integer number (8135154).

Almost surely, 2^51221255 is an apocalyptic number.

51221255 is a deficient number, since it is larger than the sum of its proper divisors (13859977).

51221255 is a wasteful number, since it uses less digits than its factorization.

51221255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602625.

The product of its digits is 1000, while the sum is 23.

The square root of 51221255 is about 7156.9026121640. The cubic root of 51221255 is about 371.3784834191.

The spelling of 51221255 in words is "fifty-one million, two hundred twenty-one thousand, two hundred fifty-five".