945241981 has 2 divisors, whose sum is σ = 945241982. Its totient is φ = 945241980.

The previous prime is 945241961. The next prime is 945241993. The reversal of 945241981 is 189142549.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 773396100 + 171845881 = 27810^2 + 13109^2 .

It is a cyclic number.

It is not a de Polignac number, because 945241981 - 2⁷ = 945241853 is a prime.

It is a super-2 number, since 2×945241981² = 1786964805289608722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945241961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472620990 + 472620991.

It is an arithmetic number, because the mean of its divisors is an integer number (472620991).

Almost surely, 2^945241981 is an apocalyptic number.

It is an amenable number.

945241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

945241981 is an equidigital number, since it uses as much as digits as its factorization.

945241981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 945241981 is about 30744.7878672142. The cubic root of 945241981 is about 981.4036463206.

The spelling of 945241981 in words is "nine hundred forty-five million, two hundred forty-one thousand, nine hundred eighty-one".