389083661 has 2 divisors, whose sum is σ = 389083662. Its totient is φ = 389083660.

The previous prime is 389083637. The next prime is 389083679. The reversal of 389083661 is 166380983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372721636 + 16362025 = 19306^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 389083661 - 2²² = 384889357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389083631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194541830 + 194541831.

It is an arithmetic number, because the mean of its divisors is an integer number (194541831).

Almost surely, 2^389083661 is an apocalyptic number.

It is an amenable number.

389083661 is a deficient number, since it is larger than the sum of its proper divisors (1).

389083661 is an equidigital number, since it uses as much as digits as its factorization.

389083661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 389083661 is about 19725.2036998354. The cubic root of 389083661 is about 730.0416946223.

The spelling of 389083661 in words is "three hundred eighty-nine million, eighty-three thousand, six hundred sixty-one".