389563364581 has 4 divisors (see below), whose sum is σ = 389884522732. Its totient is φ = 389242206432.

The previous prime is 389563364513. The next prime is 389563364591. The reversal of 389563364581 is 185463365983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185463365983 = 7 ⋅26494766569.

It can be written as a sum of positive squares in 2 ways, for example, as 4709390625 + 384853973956 = 68625^2 + 620366^2 .

It is a cyclic number.

It is not a de Polignac number, because 389563364581 - 2¹³ = 389563356389 is a prime.

It is a super-2 number, since 2×389563364581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389563364591) 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, 160577256 + ... + 160579681.

It is an arithmetic number, because the mean of its divisors is an integer number (97471130683).

Almost surely, 2^389563364581 is an apocalyptic number.

It is an amenable number.

389563364581 is a deficient number, since it is larger than the sum of its proper divisors (321158151).

389563364581 is a wasteful number, since it uses less digits than its factorization.

389563364581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321158150.

The product of its digits is 55987200, while the sum is 61.

The spelling of 389563364581 in words is "three hundred eighty-nine billion, five hundred sixty-three million, three hundred sixty-four thousand, five hundred eighty-one".