2630921 has 2 divisors, whose sum is σ = 2630922. Its totient is φ = 2630920.

The previous prime is 2630917. The next prime is 2630923. The reversal of 2630921 is 1290362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 640000 = 1411^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2630921 - 2² = 2630917 is a prime.

Together with 2630923, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2¹¹ + 6² + 3⁵ + 0 + 9⁶ + 2²¹ + 1 .

It is not a weakly prime, because it can be changed into another prime (2630923) 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, 1315460 + 1315461.

It is an arithmetic number, because the mean of its divisors is an integer number (1315461).

2^2630921 is an apocalyptic number.

It is an amenable number.

2630921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2630921 is an equidigital number, since it uses as much as digits as its factorization.

2630921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2630921 is about 1622.0114056319. The cubic root of 2630921 is about 138.0498489659.

The spelling of 2630921 in words is "two million, six hundred thirty thousand, nine hundred twenty-one".