389067521 has 2 divisors, whose sum is σ = 389067522. Its totient is φ = 389067520.

The previous prime is 389067499. The next prime is 389067583. The reversal of 389067521 is 125760983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330330625 + 58736896 = 18175^2 + 7664^2 .

It is an emirp because it is prime and its reverse (125760983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389067521 - 2¹⁰ = 389066497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (389067121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194533760 + 194533761.

It is an arithmetic number, because the mean of its divisors is an integer number (194533761).

Almost surely, 2^389067521 is an apocalyptic number.

It is an amenable number.

389067521 is a deficient number, since it is larger than the sum of its proper divisors (1).

389067521 is an equidigital number, since it uses as much as digits as its factorization.

389067521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 389067521 is about 19724.7945743422. The cubic root of 389067521 is about 730.0315999332.

The spelling of 389067521 in words is "three hundred eighty-nine million, sixty-seven thousand, five hundred twenty-one".