2629661 has 2 divisors, whose sum is σ = 2629662. Its totient is φ = 2629660.

The previous prime is 2629651. The next prime is 2629667. The reversal of 2629661 is 1669262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1907161 + 722500 = 1381^2 + 850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2629661 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₁₉₁₈₅₈ and since 2629661 and 191858 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2629667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314830 + 1314831.

It is an arithmetic number, because the mean of its divisors is an integer number (1314831).

2^2629661 is an apocalyptic number.

It is an amenable number.

2629661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2629661 is an equidigital number, since it uses as much as digits as its factorization.

2629661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 2629661 is about 1621.6229524769. The cubic root of 2629661 is about 138.0278071809.

The spelling of 2629661 in words is "two million, six hundred twenty-nine thousand, six hundred sixty-one".