931661 has 4 divisors (see below), whose sum is σ = 972192. Its totient is φ = 891132.

The previous prime is 931657. The next prime is 931691. The reversal of 931661 is 166139.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166139 = 103 ⋅1613.

It is a cyclic number.

It is not a de Polignac number, because 931661 - 2² = 931657 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 931661.

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 931661.

It is not an unprimeable number, because it can be changed into a prime (931621) 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, 20231 + ... + 20276.

It is an arithmetic number, because the mean of its divisors is an integer number (243048).

2⁹³¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

931661 is a deficient number, since it is larger than the sum of its proper divisors (40531).

931661 is a wasteful number, since it uses less digits than its factorization.

931661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40530.

The product of its digits is 972, while the sum is 26.

The square root of 931661 is about 965.2258802995. The cubic root of 931661 is about 97.6680773920.

The spelling of 931661 in words is "nine hundred thirty-one thousand, six hundred sixty-one".