51943939 has 2 divisors, whose sum is σ = 51943940. Its totient is φ = 51943938.

The previous prime is 51943861. The next prime is 51943949. The reversal of 51943939 is 93934915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51943939 - 2⁷ = 51943811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51943895 and 51943904.

It is not a weakly prime, because it can be changed into another prime (51943949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25971969 + 25971970.

It is an arithmetic number, because the mean of its divisors is an integer number (25971970).

Almost surely, 2^51943939 is an apocalyptic number.

51943939 is a deficient number, since it is larger than the sum of its proper divisors (1).

51943939 is an equidigital number, since it uses as much as digits as its factorization.

51943939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 51943939 is about 7207.2143717250. The cubic root of 51943939 is about 373.1169339191.

The spelling of 51943939 in words is "fifty-one million, nine hundred forty-three thousand, nine hundred thirty-nine".