945989621 has 2 divisors, whose sum is σ = 945989622. Its totient is φ = 945989620.

The previous prime is 945989509. The next prime is 945989623. The reversal of 945989621 is 126989549.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 940648900 + 5340721 = 30670^2 + 2311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-945989621 is a prime.

Together with 945989623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945989623) 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, 472994810 + 472994811.

It is an arithmetic number, because the mean of its divisors is an integer number (472994811).

Almost surely, 2^945989621 is an apocalyptic number.

It is an amenable number.

945989621 is a deficient number, since it is larger than the sum of its proper divisors (1).

945989621 is an equidigital number, since it uses as much as digits as its factorization.

945989621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 53.

The square root of 945989621 is about 30756.9442727980. The cubic root of 945989621 is about 981.6623254990.

The spelling of 945989621 in words is "nine hundred forty-five million, nine hundred eighty-nine thousand, six hundred twenty-one".