10999661 has 2 divisors, whose sum is σ = 10999662. Its totient is φ = 10999660.

The previous prime is 10999657. The next prime is 10999669. The reversal of 10999661 is 16699901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 175561 = 3290^2 + 419^2 .

It is an emirp because it is prime and its reverse (16699901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10999661 - 2² = 10999657 is a prime.

It is a super-2 number, since 2×10999661² = 241985084229842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10999669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5499830 + 5499831.

It is an arithmetic number, because the mean of its divisors is an integer number (5499831).

Almost surely, 2^10999661 is an apocalyptic number.

It is an amenable number.

10999661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10999661 is an equidigital number, since it uses as much as digits as its factorization.

10999661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 10999661 is about 3316.5736837887. The cubic root of 10999661 is about 222.3957243994.

The spelling of 10999661 in words is "ten million, nine hundred ninety-nine thousand, six hundred sixty-one".