945715021 has 2 divisors, whose sum is σ = 945715022. Its totient is φ = 945715020.

The previous prime is 945715019. The next prime is 945715033. The reversal of 945715021 is 120517549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887742025 + 57972996 = 29795^2 + 7614^2 .

It is an emirp because it is prime and its reverse (120517549) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 945715021 - 2¹ = 945715019 is a prime.

Together with 945715019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945715051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472857510 + 472857511.

It is an arithmetic number, because the mean of its divisors is an integer number (472857511).

Almost surely, 2^945715021 is an apocalyptic number.

It is an amenable number.

945715021 is a deficient number, since it is larger than the sum of its proper divisors (1).

945715021 is an equidigital number, since it uses as much as digits as its factorization.

945715021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 945715021 is about 30752.4799162604. The cubic root of 945715021 is about 981.5673313061.

The spelling of 945715021 in words is "nine hundred forty-five million, seven hundred fifteen thousand, twenty-one".