136403321 has 2 divisors, whose sum is σ = 136403322. Its totient is φ = 136403320.

The previous prime is 136403303. The next prime is 136403383. The reversal of 136403321 is 123304631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97515625 + 38887696 = 9875^2 + 6236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136403321 is a prime.

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 (136403021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68201660 + 68201661.

It is an arithmetic number, because the mean of its divisors is an integer number (68201661).

Almost surely, 2^136403321 is an apocalyptic number.

It is an amenable number.

136403321 is a deficient number, since it is larger than the sum of its proper divisors (1).

136403321 is an equidigital number, since it uses as much as digits as its factorization.

136403321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 136403321 is about 11679.1832334286. The cubic root of 136403321 is about 514.7641751852.

Adding to 136403321 its reverse (123304631), we get a palindrome (259707952).

It can be divided in two parts, 13640 and 3321, that added together give a palindrome (16961).

The spelling of 136403321 in words is "one hundred thirty-six million, four hundred three thousand, three hundred twenty-one".