921442289 has 2 divisors, whose sum is σ = 921442290. Its totient is φ = 921442288.

The previous prime is 921442283. The next prime is 921442309. The reversal of 921442289 is 982244129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607869025 + 313573264 = 24655^2 + 17708^2 .

It is an emirp because it is prime and its reverse (982244129) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921442289 is a prime.

It is not a weakly prime, because it can be changed into another prime (921442283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460721144 + 460721145.

It is an arithmetic number, because the mean of its divisors is an integer number (460721145).

Almost surely, 2^921442289 is an apocalyptic number.

It is an amenable number.

921442289 is a deficient number, since it is larger than the sum of its proper divisors (1).

921442289 is an equidigital number, since it uses as much as digits as its factorization.

921442289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 921442289 is about 30355.2678953753. The cubic root of 921442289 is about 973.0968051204.

The spelling of 921442289 in words is "nine hundred twenty-one million, four hundred forty-two thousand, two hundred eighty-nine".