891366461 has 2 divisors, whose sum is σ = 891366462. Its totient is φ = 891366460.

The previous prime is 891366451. The next prime is 891366473. The reversal of 891366461 is 164663198.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 856674361 + 34692100 = 29269^2 + 5890^2 .

It is a cyclic number.

It is not a de Polignac number, because 891366461 - 2⁶ = 891366397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891366451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445683230 + 445683231.

It is an arithmetic number, because the mean of its divisors is an integer number (445683231).

Almost surely, 2^891366461 is an apocalyptic number.

It is an amenable number.

891366461 is a deficient number, since it is larger than the sum of its proper divisors (1).

891366461 is an equidigital number, since it uses as much as digits as its factorization.

891366461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 891366461 is about 29855.7609348682. The cubic root of 891366461 is about 962.3922041756.

The spelling of 891366461 in words is "eight hundred ninety-one million, three hundred sixty-six thousand, four hundred sixty-one".