50645981 has 2 divisors, whose sum is σ = 50645982. Its totient is φ = 50645980.

The previous prime is 50645951. The next prime is 50646017. The reversal of 50645981 is 18954605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 22714756 = 5285^2 + 4766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50645981 is a prime.

It is a super-2 number, since 2×50645981² = 5130030782904722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50645911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25322990 + 25322991.

It is an arithmetic number, because the mean of its divisors is an integer number (25322991).

Almost surely, 2^50645981 is an apocalyptic number.

It is an amenable number.

50645981 is a deficient number, since it is larger than the sum of its proper divisors (1).

50645981 is an equidigital number, since it uses as much as digits as its factorization.

50645981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 50645981 is about 7116.5989770395. The cubic root of 50645981 is about 369.9829088770.

The spelling of 50645981 in words is "fifty million, six hundred forty-five thousand, nine hundred eighty-one".