810997 has 4 divisors (see below), whose sum is σ = 884736. Its totient is φ = 737260.

The previous prime is 810989. The next prime is 811037. The reversal of 810997 is 799018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 810997 - 2³ = 810989 is a prime.

It is a super-2 number, since 2×810997² = 1315432268018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36853 + ... + 36874.

It is an arithmetic number, because the mean of its divisors is an integer number (221184).

2⁸¹⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

810997 is a deficient number, since it is larger than the sum of its proper divisors (73739).

810997 is a wasteful number, since it uses less digits than its factorization.

810997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73738.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 810997 is about 900.5537185532. The cubic root of 810997 is about 93.2552053100.

The spelling of 810997 in words is "eight hundred ten thousand, nine hundred ninety-seven".