12102661 has 2 divisors, whose sum is σ = 12102662. Its totient is φ = 12102660.

The previous prime is 12102653. The next prime is 12102689. The reversal of 12102661 is 16620121.

12102661 = T₂₈₃₉ + T₂₈₄₀ + T₂₈₄₁.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8300161 + 3802500 = 2881^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102661 - 2³ = 12102653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12102631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051330 + 6051331.

It is an arithmetic number, because the mean of its divisors is an integer number (6051331).

Almost surely, 2^12102661 is an apocalyptic number.

12102661 is the 2841-st centered triangular number.

It is an amenable number.

12102661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12102661 is an equidigital number, since it uses as much as digits as its factorization.

12102661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12102661 is about 3478.8878970154. The cubic root of 12102661 is about 229.5938705584.

Adding to 12102661 its reverse (16620121), we get a palindrome (28722782).

The spelling of 12102661 in words is "twelve million, one hundred two thousand, six hundred sixty-one".