500941981 has 2 divisors, whose sum is σ = 500941982. Its totient is φ = 500941980.

The previous prime is 500941967. The next prime is 500941993. The reversal of 500941981 is 189149005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380601081 + 120340900 = 19509^2 + 10970^2 .

It is a cyclic number.

It is not a de Polignac number, because 500941981 - 2⁵ = 500941949 is a prime.

It is a super-2 number, since 2×500941981² = 501885736656408722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 500941981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (500941901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250470990 + 250470991.

It is an arithmetic number, because the mean of its divisors is an integer number (250470991).

Almost surely, 2^500941981 is an apocalyptic number.

It is an amenable number.

500941981 is a deficient number, since it is larger than the sum of its proper divisors (1).

500941981 is an equidigital number, since it uses as much as digits as its factorization.

500941981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 500941981 is about 22381.7331991962. The cubic root of 500941981 is about 794.1986471779.

The spelling of 500941981 in words is "five hundred million, nine hundred forty-one thousand, nine hundred eighty-one".