389025521 has 2 divisors, whose sum is σ = 389025522. Its totient is φ = 389025520.

The previous prime is 389025503. The next prime is 389025523. The reversal of 389025521 is 125520983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351375025 + 37650496 = 18745^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 389025521 - 2⁶ = 389025457 is a prime.

Together with 389025523, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_20781944 and since 389025521 and 20781944 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (389025523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194512760 + 194512761.

It is an arithmetic number, because the mean of its divisors is an integer number (194512761).

Almost surely, 2^389025521 is an apocalyptic number.

It is an amenable number.

389025521 is a deficient number, since it is larger than the sum of its proper divisors (1).

389025521 is an equidigital number, since it uses as much as digits as its factorization.

389025521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 389025521 is about 19723.7298957373. The cubic root of 389025521 is about 730.0053299167.

The spelling of 389025521 in words is "three hundred eighty-nine million, twenty-five thousand, five hundred twenty-one".