51943949 has 2 divisors, whose sum is σ = 51943950. Its totient is φ = 51943948.

The previous prime is 51943939. The next prime is 51943951. The reversal of 51943949 is 94934915.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42445225 + 9498724 = 6515^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 51943949 - 2²⁰ = 50895373 is a prime.

Together with 51943951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51943939) 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 as a sum of consecutive naturals, namely, 25971974 + 25971975.

It is an arithmetic number, because the mean of its divisors is an integer number (25971975).

Almost surely, 2^51943949 is an apocalyptic number.

It is an amenable number.

51943949 is a deficient number, since it is larger than the sum of its proper divisors (1).

51943949 is an equidigital number, since it uses as much as digits as its factorization.

51943949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 51943949 is about 7207.2150654743. The cubic root of 51943949 is about 373.1169578627.

The spelling of 51943949 in words is "fifty-one million, nine hundred forty-three thousand, nine hundred forty-nine".