51689933 has 2 divisors, whose sum is σ = 51689934. Its totient is φ = 51689932.

The previous prime is 51689923. The next prime is 51689941. The reversal of 51689933 is 33998615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30327049 + 21362884 = 5507^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 51689933 - 2¹⁰ = 51688909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51689903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844966 + 25844967.

It is an arithmetic number, because the mean of its divisors is an integer number (25844967).

Almost surely, 2^51689933 is an apocalyptic number.

It is an amenable number.

51689933 is a deficient number, since it is larger than the sum of its proper divisors (1).

51689933 is an equidigital number, since it uses as much as digits as its factorization.

51689933 is an evil number, because the sum of its binary digits is even.

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

The square root of 51689933 is about 7189.5711276821. The cubic root of 51689933 is about 372.5077589483.

The spelling of 51689933 in words is "fifty-one million, six hundred eighty-nine thousand, nine hundred thirty-three".