320986261 has 2 divisors, whose sum is σ = 320986262. Its totient is φ = 320986260.

The previous prime is 320986249. The next prime is 320986273. The reversal of 320986261 is 162689023.

It is a balanced prime because it is at equal distance from previous prime (320986249) and next prime (320986273).

It can be written as a sum of positive squares in only one way, i.e., 179828100 + 141158161 = 13410^2 + 11881^2 .

It is a cyclic number.

It is not a de Polignac number, because 320986261 - 2¹³ = 320978069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320986261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320986291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160493130 + 160493131.

It is an arithmetic number, because the mean of its divisors is an integer number (160493131).

Almost surely, 2^320986261 is an apocalyptic number.

It is an amenable number.

320986261 is a deficient number, since it is larger than the sum of its proper divisors (1).

320986261 is an equidigital number, since it uses as much as digits as its factorization.

320986261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 320986261 is about 17916.0894449654. The cubic root of 320986261 is about 684.6923590586.

The spelling of 320986261 in words is "three hundred twenty million, nine hundred eighty-six thousand, two hundred sixty-one".