51949281 has 8 divisors (see below), whose sum is σ = 69423840. Its totient is φ = 34553792.

The previous prime is 51949267. The next prime is 51949283. The reversal of 51949281 is 18294915.

51949281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51949281 - 2⁷ = 51949153 is a prime.

It is a super-2 number, since 2×51949281² = 5397455592833922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51949283) 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 7 ways as a sum of consecutive naturals, for example, 18216 + ... + 20873.

It is an arithmetic number, because the mean of its divisors is an integer number (8677980).

Almost surely, 2^51949281 is an apocalyptic number.

It is an amenable number.

51949281 is a deficient number, since it is larger than the sum of its proper divisors (17474559).

51949281 is a wasteful number, since it uses less digits than its factorization.

51949281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39535.

The product of its digits is 25920, while the sum is 39.

The square root of 51949281 is about 7207.5849630788. The cubic root of 51949281 is about 373.1297241335.

The spelling of 51949281 in words is "fifty-one million, nine hundred forty-nine thousand, two hundred eighty-one".