51951881 has 8 divisors (see below), whose sum is σ = 55627560. Its totient is φ = 48345088.

The previous prime is 51951859. The next prime is 51951883. The reversal of 51951881 is 18815915.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5929225 + 46022656 = 2435^2 + 6784^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51951881 is a prime.

It is a super-2 number, since 2×51951881² = 5397995878876322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51951883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15656 + ... + 18681.

It is an arithmetic number, because the mean of its divisors is an integer number (6953445).

Almost surely, 2^51951881 is an apocalyptic number.

It is an amenable number.

51951881 is a deficient number, since it is larger than the sum of its proper divisors (3675679).

51951881 is a wasteful number, since it uses less digits than its factorization.

51951881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34443.

The product of its digits is 14400, while the sum is 38.

The square root of 51951881 is about 7207.7653263685. The cubic root of 51951881 is about 373.1359489299.

The spelling of 51951881 in words is "fifty-one million, nine hundred fifty-one thousand, eight hundred eighty-one".