389987559121 has 4 divisors (see below), whose sum is σ = 389988813412. Its totient is φ = 389986304832.

The previous prime is 389987559109. The next prime is 389987559139. The reversal of 389987559121 is 121955789983.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7184257600 + 382803301521 = 84760^2 + 618711^2 .

It is a cyclic number.

It is not a de Polignac number, because 389987559121 - 2²¹ = 389985461969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389987559821) 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, 227101 + ... + 911893.

It is an arithmetic number, because the mean of its divisors is an integer number (97497203353).

Almost surely, 2^389987559121 is an apocalyptic number.

It is an amenable number.

389987559121 is a deficient number, since it is larger than the sum of its proper divisors (1254291).

389987559121 is an equidigital number, since it uses as much as digits as its factorization.

389987559121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254290.

The product of its digits is 48988800, while the sum is 67.

The spelling of 389987559121 in words is "three hundred eighty-nine billion, nine hundred eighty-seven million, five hundred fifty-nine thousand, one hundred twenty-one".