136400237 has 2 divisors, whose sum is σ = 136400238. Its totient is φ = 136400236.

The previous prime is 136400203. The next prime is 136400261. The reversal of 136400237 is 732004631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88153321 + 48246916 = 9389^2 + 6946^2 .

It is a cyclic number.

It is not a de Polignac number, because 136400237 - 2⁸ = 136399981 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136400267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68200118 + 68200119.

It is an arithmetic number, because the mean of its divisors is an integer number (68200119).

Almost surely, 2^136400237 is an apocalyptic number.

It is an amenable number.

136400237 is a deficient number, since it is larger than the sum of its proper divisors (1).

136400237 is an equidigital number, since it uses as much as digits as its factorization.

136400237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 136400237 is about 11679.0512029017. The cubic root of 136400237 is about 514.7602956495.

Adding to 136400237 its reverse (732004631), we get a palindrome (868404868).

The spelling of 136400237 in words is "one hundred thirty-six million, four hundred thousand, two hundred thirty-seven".