51690943 has 2 divisors, whose sum is σ = 51690944. Its totient is φ = 51690942.

The previous prime is 51690941. The next prime is 51690949. The reversal of 51690943 is 34909615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51690943 - 2¹ = 51690941 is a prime.

Together with 51690941, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51690941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25845471 + 25845472.

It is an arithmetic number, because the mean of its divisors is an integer number (25845472).

Almost surely, 2^51690943 is an apocalyptic number.

51690943 is a deficient number, since it is larger than the sum of its proper divisors (1).

51690943 is an equidigital number, since it uses as much as digits as its factorization.

51690943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 51690943 is about 7189.6413679682. The cubic root of 51690943 is about 372.5101851486.

The spelling of 51690943 in words is "fifty-one million, six hundred ninety thousand, nine hundred forty-three".