918632153209 has 9 divisors (see below), whose sum is σ = 920731153797. Its totient is φ = 916537933404.

The previous prime is 918632153189. The next prime is 918632153213. The reversal of 918632153209 is 902351236819.

The square root of 918632153209 is 958453.

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

It is not a de Polignac number, because 918632153209 - 2¹¹ = 918632151161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918632153249) 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, 581780182 + ... + 581781760.

It is an arithmetic number, because the mean of its divisors is an integer number (102303461533).

Almost surely, 2^918632153209 is an apocalyptic number.

918632153209 is the 958453-rd square number.

918632153209 is the 479227-th centered octagonal number.

It is an amenable number.

918632153209 is a deficient number, since it is larger than the sum of its proper divisors (2099000588).

918632153209 is an frugal number, since it uses more digits than its factorization.

918632153209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372 (or 2186 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

Multiplying 918632153209 by its sum of digits (49), we get a square (45012975507241 = 6709171²).

The spelling of 918632153209 in words is "nine hundred eighteen billion, six hundred thirty-two million, one hundred fifty-three thousand, two hundred nine".