51481217 has 4 divisors (see below), whose sum is σ = 52353840. Its totient is φ = 50608596.

The previous prime is 51481201. The next prime is 51481223. The reversal of 51481217 is 71218415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51481217 - 2⁴ = 51481201 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 51481217.

It is not an unprimeable number, because it can be changed into a prime (51481237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436223 + ... + 436340.

It is an arithmetic number, because the mean of its divisors is an integer number (13088460).

Almost surely, 2^51481217 is an apocalyptic number.

It is an amenable number.

51481217 is a deficient number, since it is larger than the sum of its proper divisors (872623).

51481217 is an equidigital number, since it uses as much as digits as its factorization.

51481217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872622.

The product of its digits is 2240, while the sum is 29.

The square root of 51481217 is about 7175.0412542368. The cubic root of 51481217 is about 372.0057062562.

The spelling of 51481217 in words is "fifty-one million, four hundred eighty-one thousand, two hundred seventeen".