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121661 is a prime number
BaseRepresentation
bin11101101100111101
320011212222
4131230331
512343121
62335125
71014461
oct355475
9204788
10121661
1183451
125a4a5
13434b7
14324a1
15260ab
hex1db3d

121661 has 2 divisors, whose sum is σ = 121662. Its totient is φ = 121660.

The previous prime is 121637. The next prime is 121687. The reversal of 121661 is 166121.

It is a happy number.

121661 is nontrivially palindromic in base 12.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109561 + 12100 = 331^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 121661 - 214 = 105277 is a prime.

It is a Chen prime.

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 121661.

It is not a weakly prime, because it can be changed into another prime (121621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60830 + 60831.

It is an arithmetic number, because the mean of its divisors is an integer number (60831).

2121661 is an apocalyptic number.

It is an amenable number.

121661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121661 is an equidigital number, since it uses as much as digits as its factorization.

121661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 121661 is about 348.7993692655. The cubic root of 121661 is about 49.5507760440.

Adding to 121661 its reverse (166121), we get a palindrome (287782).

It can be divided in two parts, 12166 and 1, that added together give a cube (12167 = 233).

The spelling of 121661 in words is "one hundred twenty-one thousand, six hundred sixty-one".