889364049721 has 27 divisors (see below), whose sum is σ = 1041329443599. Its totient is φ = 757360972368.

The previous prime is 889364049713. The next prime is 889364049767. The reversal of 889364049721 is 127940463988.

The square root of 889364049721 is 943061.

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

It can be written as a sum of positive squares in only one way, i.e., 884117075625 + 5246974096 = 940275^2 + 72436^2 .

It is not a de Polignac number, because 889364049721 - 2³ = 889364049713 is a prime.

It is a super-2 number, since 2×889364049721² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 889364049721.

It is not an unprimeable number, because it can be changed into a prime (889364049421) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1313683635 + ... + 1313684311.

Almost surely, 2^889364049721 is an apocalyptic number.

889364049721 is the 943061-st square number.

889364049721 is the 471531-st centered octagonal number.

It is an amenable number.

889364049721 is a deficient number, since it is larger than the sum of its proper divisors (151965393878).

889364049721 is an frugal number, since it uses more digits than its factorization.

889364049721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 889364049721 in words is "eight hundred eighty-nine billion, three hundred sixty-four million, forty-nine thousand, seven hundred twenty-one".