389281261 has 2 divisors, whose sum is σ = 389281262. Its totient is φ = 389281260.

The previous prime is 389281159. The next prime is 389281267. The reversal of 389281261 is 162182983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198979236 + 190302025 = 14106^2 + 13795^2 .

It is a cyclic number.

It is not a de Polignac number, because 389281261 - 2¹³ = 389273069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389281267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194640630 + 194640631.

It is an arithmetic number, because the mean of its divisors is an integer number (194640631).

Almost surely, 2^389281261 is an apocalyptic number.

It is an amenable number.

389281261 is a deficient number, since it is larger than the sum of its proper divisors (1).

389281261 is an equidigital number, since it uses as much as digits as its factorization.

389281261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 389281261 is about 19730.2118843159. The cubic root of 389281261 is about 730.1652600142.

The spelling of 389281261 in words is "three hundred eighty-nine million, two hundred eighty-one thousand, two hundred sixty-one".