51690941 has 2 divisors, whose sum is σ = 51690942. Its totient is φ = 51690940.

The previous prime is 51690937. The next prime is 51690943. The reversal of 51690941 is 14909615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51179716 + 511225 = 7154^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 51690941 - 2² = 51690937 is a prime.

Together with 51690943, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3096359 and since 51690941 and 3096359 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51690943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25845470 + 25845471.

It is an arithmetic number, because the mean of its divisors is an integer number (25845471).

Almost surely, 2^51690941 is an apocalyptic number.

It is an amenable number.

51690941 is a deficient number, since it is larger than the sum of its proper divisors (1).

51690941 is an equidigital number, since it uses as much as digits as its factorization.

51690941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 51690941 is about 7189.6412288792. The cubic root of 51690941 is about 372.5101803443.

The spelling of 51690941 in words is "fifty-one million, six hundred ninety thousand, nine hundred forty-one".