389212661 has 2 divisors, whose sum is σ = 389212662. Its totient is φ = 389212660.

The previous prime is 389212633. The next prime is 389212679. The reversal of 389212661 is 166212983.

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., 250114225 + 139098436 = 15815^2 + 11794^2 .

It is a cyclic number.

It is not a de Polignac number, because 389212661 - 2²⁶ = 322103797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389212561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194606330 + 194606331.

It is an arithmetic number, because the mean of its divisors is an integer number (194606331).

Almost surely, 2^389212661 is an apocalyptic number.

It is an amenable number.

389212661 is a deficient number, since it is larger than the sum of its proper divisors (1).

389212661 is an equidigital number, since it uses as much as digits as its factorization.

389212661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 389212661 is about 19728.4733570543. The cubic root of 389212661 is about 730.1223670518.

The spelling of 389212661 in words is "three hundred eighty-nine million, two hundred twelve thousand, six hundred sixty-one".