389525681 has 4 divisors (see below), whose sum is σ = 390507252. Its totient is φ = 388544112.

The previous prime is 389525671. The next prime is 389525701. The reversal of 389525681 is 186525983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 322023025 + 67502656 = 17945^2 + 8216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389525681 is a prime.

It is a super-2 number, since 2×389525681² = 303460512317027522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389525671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490190 + ... + 490983.

It is an arithmetic number, because the mean of its divisors is an integer number (97626813).

Almost surely, 2^389525681 is an apocalyptic number.

It is an amenable number.

389525681 is a deficient number, since it is larger than the sum of its proper divisors (981571).

389525681 is an equidigital number, since it uses as much as digits as its factorization.

389525681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981570.

The product of its digits is 518400, while the sum is 47.

The square root of 389525681 is about 19736.4049664573. The cubic root of 389525681 is about 730.3180455638.

The spelling of 389525681 in words is "three hundred eighty-nine million, five hundred twenty-five thousand, six hundred eighty-one".