891366473 has 2 divisors, whose sum is σ = 891366474. Its totient is φ = 891366472.

The previous prime is 891366461. The next prime is 891366481. The reversal of 891366473 is 374663198.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647600704 + 243765769 = 25448^2 + 15613^2 .

It is a cyclic number.

It is not a de Polignac number, because 891366473 - 2¹⁶ = 891300937 is a prime.

It is not a weakly prime, because it can be changed into another prime (891366493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445683236 + 445683237.

It is an arithmetic number, because the mean of its divisors is an integer number (445683237).

Almost surely, 2^891366473 is an apocalyptic number.

It is an amenable number.

891366473 is a deficient number, since it is larger than the sum of its proper divisors (1).

891366473 is an equidigital number, since it uses as much as digits as its factorization.

891366473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 891366473 is about 29855.7611358344. The cubic root of 891366473 is about 962.3922084943.

The spelling of 891366473 in words is "eight hundred ninety-one million, three hundred sixty-six thousand, four hundred seventy-three".