236742935921209 has 3 divisors (see below), whose sum is σ = 236742951307663. Its totient is φ = 236742920534756.

The previous prime is 236742935921189. The next prime is 236742935921227. The reversal of 236742935921209 is 902129539247632.

It is a happy number.

The square root of 236742935921209 is 15386453.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2156095773225 + 234586840147984 = 1468365^2 + 15316228^2 .

It is not a de Polignac number, because 236742935921209 - 2⁷ = 236742935921081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (236742935928209) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7693227 + ... + 23079679.

Almost surely, 2^{236742935921209} is an apocalyptic number.

236742935921209 is the 15386453-rd square number.

236742935921209 is the 7693227-th centered octagonal number.

It is an amenable number.

236742935921209 is a deficient number, since it is larger than the sum of its proper divisors (15386454).

236742935921209 is an frugal number, since it uses more digits than its factorization.

236742935921209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30772906 (or 15386453 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 64.

The spelling of 236742935921209 in words is "two hundred thirty-six trillion, seven hundred forty-two billion, nine hundred thirty-five million, nine hundred twenty-one thousand, two hundred nine".