869601121 has 9 divisors (see below), whose sum is σ = 894861849. Its totient is φ = 845036784.

The previous prime is 869601077. The next prime is 869601127. The reversal of 869601121 is 121106968.

The square root of 869601121 is 29489.

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

It can be written as a sum of positive squares in 4 ways, for example, as 157778721 + 711822400 = 12561^2 + 26680^2 .

It is not a de Polignac number, because 869601121 - 2¹⁹ = 869076833 is a prime.

It is a super-2 number, since 2×869601121² = 1512412219288913282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869601127) 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, 1090695 + ... + 1091491.

Almost surely, 2^869601121 is an apocalyptic number.

869601121 is the 29489-th square number.

869601121 is the 14745-th centered octagonal number.

It is an amenable number.

869601121 is a deficient number, since it is larger than the sum of its proper divisors (25260728).

869601121 is an frugal number, since it uses more digits than its factorization.

869601121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The cubic root of 869601121 is about 954.4943536311.

Multiplying 869601121 by its product of nonzero digits (5184), we get a square (4508012211264 = 2123208²).

The spelling of 869601121 in words is "eight hundred sixty-nine million, six hundred one thousand, one hundred twenty-one".