911661 has 8 divisors (see below), whose sum is σ = 1220160. Its totient is φ = 605472.

The previous prime is 911657. The next prime is 911663. The reversal of 911661 is 166119.

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

It is not a de Polignac number, because 911661 - 2² = 911657 is a prime.

It is a super-2 number, since 2×911661² = 1662251557842, which contains 22 as substring.

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 911661.

It is not an unprimeable number, because it can be changed into a prime (911663) 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, 856 + ... + 1598.

It is an arithmetic number, because the mean of its divisors is an integer number (152520).

2⁹¹¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

911661 is a deficient number, since it is larger than the sum of its proper divisors (308499).

911661 is a wasteful number, since it uses less digits than its factorization.

911661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155.

The product of its digits is 324, while the sum is 24.

The square root of 911661 is about 954.8094050647. The cubic root of 911661 is about 96.9641345422.

It can be divided in two parts, 91 and 1661, that multiplied together give a palindrome (151151).

The spelling of 911661 in words is "nine hundred eleven thousand, six hundred sixty-one".