389899087561 has 3 divisors (see below), whose sum is σ = 389899711981. Its totient is φ = 389898463142.

The previous prime is 389899087559. The next prime is 389899087583. The reversal of 389899087561 is 165780998983.

The square root of 389899087561 is 624419.

It is a perfect power (a square), and thus also a powerful number.

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 is not a de Polignac number, because 389899087561 - 2¹ = 389899087559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389899087261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 312210 + ... + 936628.

Almost surely, 2^389899087561 is an apocalyptic number.

389899087561 is the 624419-th square number.

389899087561 is the 312210-th centered octagonal number.

It is an amenable number.

389899087561 is a deficient number, since it is larger than the sum of its proper divisors (624420).

389899087561 is an frugal number, since it uses more digits than its factorization.

389899087561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248838 (or 624419 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 73.

The spelling of 389899087561 in words is "three hundred eighty-nine billion, eight hundred ninety-nine million, eighty-seven thousand, five hundred sixty-one".