813161 has 8 divisors (see below), whose sum is σ = 889344. Its totient is φ = 740160.

The previous prime is 813157. The next prime is 813167. The reversal of 813161 is 161318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 813161 - 2² = 813157 is a prime.

It is a super-2 number, since 2×813161² = 1322461623842, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813161.

It is not an unprimeable number, because it can be changed into a prime (813167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (111168).

2⁸¹³¹⁶¹ is an apocalyptic number.

It is an amenable number.

813161 is a deficient number, since it is larger than the sum of its proper divisors (76183).

813161 is a wasteful number, since it uses less digits than its factorization.

813161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591.

The product of its digits is 144, while the sum is 20.

The square root of 813161 is about 901.7544011537. The cubic root of 813161 is about 93.3380765730.

Adding to 813161 its reverse (161318), we get a palindrome (974479).

It can be divided in two parts, 8131 and 61, that added together give a 13-th power (8192 = 2¹³).

The spelling of 813161 in words is "eight hundred thirteen thousand, one hundred sixty-one".