236156149681 has 3 divisors (see below), whose sum is σ = 236156635641. Its totient is φ = 236155663722.

The previous prime is 236156149673. The next prime is 236156149687. The reversal of 236156149681 is 186941651632.

It is a happy number.

The square root of 236156149681 is 485959.

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 is not a de Polignac number, because 236156149681 - 2³ = 236156149673 is a prime.

It is a super-2 number, since 2×236156149681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (236156149687) 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, 242980 + ... + 728938.

It is an arithmetic number, because the mean of its divisors is an integer number (78718878547).

Almost surely, 2^236156149681 is an apocalyptic number.

236156149681 is the 485959-th square number.

236156149681 is the 242980-th centered octagonal number.

It is an amenable number.

236156149681 is a deficient number, since it is larger than the sum of its proper divisors (485960).

236156149681 is an frugal number, since it uses more digits than its factorization.

236156149681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971918 (or 485959 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The spelling of 236156149681 in words is "two hundred thirty-six billion, one hundred fifty-six million, one hundred forty-nine thousand, six hundred eighty-one".