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99661 is a prime number
BaseRepresentation
bin11000010101001101
312001201011
4120111031
511142121
62045221
7563362
oct302515
9161634
1099661
1168971
1249811
1336493
1428469
151e7e1
hex1854d

99661 has 2 divisors, whose sum is σ = 99662. Its totient is φ = 99660.

The previous prime is 99643. The next prime is 99667. The reversal of 99661 is 16699.

99661 is nontrivially palindromic in base 15.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86436 + 13225 = 294^2 + 115^2 .

It is an emirp because it is prime and its reverse (16699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99661 - 29 = 99149 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49830 + 49831.

It is an arithmetic number, because the mean of its divisors is an integer number (49831).

299661 is an apocalyptic number.

It is an amenable number.

99661 is a deficient number, since it is larger than the sum of its proper divisors (1).

99661 is an equidigital number, since it uses as much as digits as its factorization.

99661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 99661 is about 315.6913049167. The cubic root of 99661 is about 46.3633790020.

The spelling of 99661 in words is "ninety-nine thousand, six hundred sixty-one".