220261309 has 2 divisors, whose sum is σ = 220261310. Its totient is φ = 220261308.

The previous prime is 220261303. The next prime is 220261313. The reversal of 220261309 is 903162022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134050084 + 86211225 = 11578^2 + 9285^2 .

It is a cyclic number.

It is not a de Polignac number, because 220261309 - 2¹⁷ = 220130237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220261303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110130654 + 110130655.

It is an arithmetic number, because the mean of its divisors is an integer number (110130655).

Almost surely, 2^220261309 is an apocalyptic number.

It is an amenable number.

220261309 is a deficient number, since it is larger than the sum of its proper divisors (1).

220261309 is an equidigital number, since it uses as much as digits as its factorization.

220261309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 220261309 is about 14841.2030846559. The cubic root of 220261309 is about 603.9199901693.

The spelling of 220261309 in words is "two hundred twenty million, two hundred sixty-one thousand, three hundred nine".