50143981 has 2 divisors, whose sum is σ = 50143982. Its totient is φ = 50143980.

The previous prime is 50143967. The next prime is 50143993. The reversal of 50143981 is 18934105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42902500 + 7241481 = 6550^2 + 2691^2 .

It is a cyclic number.

It is not a de Polignac number, because 50143981 - 2⁵ = 50143949 is a prime.

It is a super-2 number, since 2×50143981² = 5028837661056722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50141981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25071990 + 25071991.

It is an arithmetic number, because the mean of its divisors is an integer number (25071991).

Almost surely, 2^50143981 is an apocalyptic number.

It is an amenable number.

50143981 is a deficient number, since it is larger than the sum of its proper divisors (1).

50143981 is an equidigital number, since it uses as much as digits as its factorization.

50143981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 50143981 is about 7081.2414871970. The cubic root of 50143981 is about 368.7564313347.

The spelling of 50143981 in words is "fifty million, one hundred forty-three thousand, nine hundred eighty-one".