136640437 has 2 divisors, whose sum is σ = 136640438. Its totient is φ = 136640436.

The previous prime is 136640429. The next prime is 136640461. The reversal of 136640437 is 734046631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 77841 = 11686^2 + 279^2 .

It is an emirp because it is prime and its reverse (734046631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136640437 - 2³ = 136640429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136640737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68320218 + 68320219.

It is an arithmetic number, because the mean of its divisors is an integer number (68320219).

Almost surely, 2^136640437 is an apocalyptic number.

It is an amenable number.

136640437 is a deficient number, since it is larger than the sum of its proper divisors (1).

136640437 is an equidigital number, since it uses as much as digits as its factorization.

136640437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 136640437 is about 11689.3300492372. The cubic root of 136640437 is about 515.0622817189.

The spelling of 136640437 in words is "one hundred thirty-six million, six hundred forty thousand, four hundred thirty-seven".