51623939 has 2 divisors, whose sum is σ = 51623940. Its totient is φ = 51623938.

The previous prime is 51623933. The next prime is 51623941. The reversal of 51623939 is 93932615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51623939 is a prime.

Together with 51623941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51623933) 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, 25811969 + 25811970.

It is an arithmetic number, because the mean of its divisors is an integer number (25811970).

Almost surely, 2^51623939 is an apocalyptic number.

51623939 is a deficient number, since it is larger than the sum of its proper divisors (1).

51623939 is an equidigital number, since it uses as much as digits as its factorization.

51623939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 51623939 is about 7184.9800973976. The cubic root of 51623939 is about 372.3491610351.

The spelling of 51623939 in words is "fifty-one million, six hundred twenty-three thousand, nine hundred thirty-nine".