6620261 has 2 divisors, whose sum is σ = 6620262. Its totient is φ = 6620260.

The previous prime is 6620231. The next prime is 6620281. The reversal of 6620261 is 1620266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3960100 + 2660161 = 1990^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620261 - 2²² = 2425957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6620231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310130 + 3310131.

It is an arithmetic number, because the mean of its divisors is an integer number (3310131).

Almost surely, 2^6620261 is an apocalyptic number.

It is an amenable number.

6620261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620261 is an equidigital number, since it uses as much as digits as its factorization.

6620261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 6620261 is about 2572.9867858192. The cubic root of 6620261 is about 187.7694945429.

The spelling of 6620261 in words is "six million, six hundred twenty thousand, two hundred sixty-one".