869129217441 has 27 divisors (see below), whose sum is σ = 1262792250993. Its totient is φ = 576031605480.

The previous prime is 869129217433. The next prime is 869129217569. The reversal of 869129217441 is 144712921968.

The square root of 869129217441 is 932271.

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

869129217441 is a `hidden beast` number, since 8 + 69 + 129 + 2 + 17 + 441 = 666.

It is not a de Polignac number, because 869129217441 - 2³ = 869129217433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (869129217431) 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, 534190470 + ... + 534192096.

Almost surely, 2^869129217441 is an apocalyptic number.

869129217441 is the 932271-st square number.

869129217441 is the 466136-th centered octagonal number.

It is an amenable number.

869129217441 is a deficient number, since it is larger than the sum of its proper divisors (393663033552).

869129217441 is an frugal number, since it uses more digits than its factorization.

869129217441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642 (or 1821 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 869129217441 in words is "eight hundred sixty-nine billion, one hundred twenty-nine million, two hundred seventeen thousand, four hundred forty-one".