939661 has 2 divisors, whose sum is σ = 939662. Its totient is φ = 939660.

The previous prime is 939649. The next prime is 939677. The reversal of 939661 is 166939.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 72900 = 931^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 939661 - 2¹¹ = 937613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469830 + 469831.

It is an arithmetic number, because the mean of its divisors is an integer number (469831).

2⁹³⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

939661 is a deficient number, since it is larger than the sum of its proper divisors (1).

939661 is an equidigital number, since it uses as much as digits as its factorization.

939661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 939661 is about 969.3611298170. The cubic root of 939661 is about 97.9468335801.

It can be divided in two parts, 939 and 661, that added together give a square (1600 = 40²).

The spelling of 939661 in words is "nine hundred thirty-nine thousand, six hundred sixty-one".