949921981 has 2 divisors, whose sum is σ = 949921982. Its totient is φ = 949921980.

The previous prime is 949921943. The next prime is 949922093. The reversal of 949921981 is 189129949.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 826045081 + 123876900 = 28741^2 + 11130^2 .

It is an emirp because it is prime and its reverse (189129949) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 949921981 - 2¹⁹ = 949397693 is a prime.

It is a super-2 number, since 2×949921981² = 1804703539973928722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (949921081) 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, 474960990 + 474960991.

It is an arithmetic number, because the mean of its divisors is an integer number (474960991).

Almost surely, 2^949921981 is an apocalyptic number.

It is an amenable number.

949921981 is a deficient number, since it is larger than the sum of its proper divisors (1).

949921981 is an equidigital number, since it uses as much as digits as its factorization.

949921981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 52.

The square root of 949921981 is about 30820.8043535531. The cubic root of 949921981 is about 983.0206607413.

The spelling of 949921981 in words is "nine hundred forty-nine million, nine hundred twenty-one thousand, nine hundred eighty-one".