897731615169 has 9 divisors (see below), whose sum is σ = 1296727549923. Its totient is φ = 598485848472.

The previous prime is 897731615167. The next prime is 897731615203. The reversal of 897731615169 is 961516137798.

The square root of 897731615169 is 947487.

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

897731615169 is a `hidden beast` number, since 8 + 9 + 7 + 7 + 3 + 1 + 615 + 1 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15897931569 + 881833683600 = 126087^2 + 939060^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 897731615169 - 2¹ = 897731615167 is a prime.

It is a super-2 number, since 2×897731615169² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (897731615167) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2684547 + ... + 3000375.

Almost surely, 2^897731615169 is an apocalyptic number.

897731615169 is the 947487-th square number.

897731615169 is the 473744-th centered octagonal number.

It is an amenable number.

897731615169 is a deficient number, since it is larger than the sum of its proper divisors (398995934754).

897731615169 is an frugal number, since it uses more digits than its factorization.

897731615169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631664 (or 315832 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 63.

It can be divided in two parts, 897731 and 615169, that added together give a square (1512900 = 1230²).

The spelling of 897731615169 in words is "eight hundred ninety-seven billion, seven hundred thirty-one million, six hundred fifteen thousand, one hundred sixty-nine".