136431690449 has 2 divisors, whose sum is σ = 136431690450. Its totient is φ = 136431690448.

The previous prime is 136431690407. The next prime is 136431690497. The reversal of 136431690449 is 944096134631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136408342225 + 23348224 = 369335^2 + 4832^2 .

It is a cyclic number.

It is not a de Polignac number, because 136431690449 - 2¹² = 136431686353 is a prime.

It is a super-2 number, since 2×136431690449² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 136431690397 and 136431690406.

It is not a weakly prime, because it can be changed into another prime (136431696449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68215845224 + 68215845225.

It is an arithmetic number, because the mean of its divisors is an integer number (68215845225).

Almost surely, 2^136431690449 is an apocalyptic number.

It is an amenable number.

136431690449 is a deficient number, since it is larger than the sum of its proper divisors (1).

136431690449 is an equidigital number, since it uses as much as digits as its factorization.

136431690449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 136431690449 in words is "one hundred thirty-six billion, four hundred thirty-one million, six hundred ninety thousand, four hundred forty-nine".