236135681 has 2 divisors, whose sum is σ = 236135682. Its totient is φ = 236135680.

The previous prime is 236135633. The next prime is 236135689. The reversal of 236135681 is 186531632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135955600 + 100180081 = 11660^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 236135681 - 2¹⁴ = 236119297 is a prime.

It is a super-2 number, since 2×236135681² = 111520119682667522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (236135689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118067840 + 118067841.

It is an arithmetic number, because the mean of its divisors is an integer number (118067841).

Almost surely, 2^236135681 is an apocalyptic number.

It is an amenable number.

236135681 is a deficient number, since it is larger than the sum of its proper divisors (1).

236135681 is an equidigital number, since it uses as much as digits as its factorization.

236135681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 236135681 is about 15366.7069016104. The cubic root of 236135681 is about 618.0930664574.

The spelling of 236135681 in words is "two hundred thirty-six million, one hundred thirty-five thousand, six hundred eighty-one".