51969 has 8 divisors (see below), whose sum is σ = 73440. Its totient is φ = 32576.

The previous prime is 51949. The next prime is 51971. The reversal of 51969 is 96915.

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 51969 - 2⁸ = 51713 is a prime.

It is a super-2 number, since 2×51969² = 5401553922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51929) 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, 459 + ... + 560.

It is an arithmetic number, because the mean of its divisors is an integer number (9180).

It is a Proth number, since it is equal to 203 ⋅ 2⁸ + 1 and 203 < 2⁸.

2⁵¹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

51969 is a deficient number, since it is larger than the sum of its proper divisors (21471).

51969 is a wasteful number, since it uses less digits than its factorization.

51969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039.

The product of its digits is 2430, while the sum is 30.

The square root of 51969 is about 227.9671028899. The cubic root of 51969 is about 37.3176929242.

It can be divided in two parts, 5196 and 9, that multiplied together give a palindrome (46764).

The spelling of 51969 in words is "fifty-one thousand, nine hundred sixty-nine".