945937981 has 2 divisors, whose sum is σ = 945937982. Its totient is φ = 945937980.

The previous prime is 945937963. The next prime is 945937991. The reversal of 945937981 is 189739549.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924464025 + 21473956 = 30405^2 + 4634^2 .

It is an emirp because it is prime and its reverse (189739549) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 945937981 - 2⁹ = 945937469 is a prime.

It is a super-2 number, since 2×945937981² = 1789597327796712722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945937991) 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, 472968990 + 472968991.

It is an arithmetic number, because the mean of its divisors is an integer number (472968991).

Almost surely, 2^945937981 is an apocalyptic number.

It is an amenable number.

945937981 is a deficient number, since it is larger than the sum of its proper divisors (1).

945937981 is an equidigital number, since it uses as much as digits as its factorization.

945937981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The square root of 945937981 is about 30756.1047761253. The cubic root of 945937981 is about 981.6444627361.

The spelling of 945937981 in words is "nine hundred forty-five million, nine hundred thirty-seven thousand, nine hundred eighty-one".