236161981225 has 27 divisors (see below), whose sum is σ = 296664911319. Its totient is φ = 186493928400.

The previous prime is 236161981219. The next prime is 236161981249. The reversal of 236161981225 is 522189161632.

The square root of 236161981225 is 485965.

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., 85018313241 + 151143667984 = 291579^2 + 388772^2 .

It is not a de Polignac number, because 236161981225 - 2³ = 236161981217 is a prime.

It is a super-2 number, since 2×236161981225² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 201674890 + ... + 201676060.

Almost surely, 2^236161981225 is an apocalyptic number.

236161981225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

236161981225 is the 485965-th square number.

236161981225 is the 242983-rd centered octagonal number.

It is an amenable number.

236161981225 is a deficient number, since it is larger than the sum of its proper divisors (60502930094).

236161981225 is an frugal number, since it uses more digits than its factorization.

236161981225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518 (or 1259 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The spelling of 236161981225 in words is "two hundred thirty-six billion, one hundred sixty-one million, nine hundred eighty-one thousand, two hundred twenty-five".