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9997661 is a prime number
BaseRepresentation
bin100110001000…
…110101011101
3200210221012202
4212020311131
510024411121
6554141245
7150656462
oct46106535
920727182
109997661
115709433
123421825
1320c079b
141483669
15d2740b
hex988d5d

9997661 has 2 divisors, whose sum is σ = 9997662. Its totient is φ = 9997660.

The previous prime is 9997643. The next prime is 9997697. The reversal of 9997661 is 1667999.

It is a happy number.

9997661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8323225 + 1674436 = 2885^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997661 - 26 = 9997597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

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 (9997601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998830 + 4998831.

It is an arithmetic number, because the mean of its divisors is an integer number (4998831).

Almost surely, 29997661 is an apocalyptic number.

It is an amenable number.

9997661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997661 is an equidigital number, since it uses as much as digits as its factorization.

9997661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 47.

The square root of 9997661 is about 3161.9078101678. The cubic root of 9997661 is about 215.4266702842.

The spelling of 9997661 in words is "nine million, nine hundred ninety-seven thousand, six hundred sixty-one".