51220169 has 16 divisors (see below), whose sum is σ = 68772480. Its totient is φ = 36840960.

The previous prime is 51220159. The next prime is 51220199. The reversal of 51220169 is 96102215.

51220169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-51220169 is a prime.

It is a super-2 number, since 2×51220169² = 5247011424777122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51220109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24584 + ... + 26585.

It is an arithmetic number, because the mean of its divisors is an integer number (4298280).

Almost surely, 2^51220169 is an apocalyptic number.

It is an amenable number.

51220169 is a deficient number, since it is larger than the sum of its proper divisors (17552311).

51220169 is a wasteful number, since it uses less digits than its factorization.

51220169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51200.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51220169 is about 7156.8267409516. The cubic root of 51220169 is about 371.3758587282.

The spelling of 51220169 in words is "fifty-one million, two hundred twenty thousand, one hundred sixty-nine".