891797 has 2 divisors, whose sum is σ = 891798. Its totient is φ = 891796.

The previous prime is 891767. The next prime is 891799. The reversal of 891797 is 797198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470596 + 421201 = 686^2 + 649^2 .

It is a cyclic number.

It is not a de Polignac number, because 891797 - 2¹² = 887701 is a prime.

Together with 891799, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891797.

It is not a weakly prime, because it can be changed into another prime (891799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445898 + 445899.

It is an arithmetic number, because the mean of its divisors is an integer number (445899).

2⁸⁹¹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

891797 is a deficient number, since it is larger than the sum of its proper divisors (1).

891797 is an equidigital number, since it uses as much as digits as its factorization.

891797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 41.

The square root of 891797 is about 944.3500410335. The cubic root of 891797 is about 96.2547127619.

The spelling of 891797 in words is "eight hundred ninety-one thousand, seven hundred ninety-seven".