135720437 has 2 divisors, whose sum is σ = 135720438. Its totient is φ = 135720436.

The previous prime is 135720433. The next prime is 135720451. The reversal of 135720437 is 734027531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 50822641 = 9214^2 + 7129^2 .

It is an emirp because it is prime and its reverse (734027531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135720437 - 2² = 135720433 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135720433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67860218 + 67860219.

It is an arithmetic number, because the mean of its divisors is an integer number (67860219).

Almost surely, 2^135720437 is an apocalyptic number.

It is an amenable number.

135720437 is a deficient number, since it is larger than the sum of its proper divisors (1).

135720437 is an equidigital number, since it uses as much as digits as its factorization.

135720437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 135720437 is about 11649.9114588910. The cubic root of 135720437 is about 513.9037062165.

Adding to 135720437 its reverse (734027531), we get a palindrome (869747968).

The spelling of 135720437 in words is "one hundred thirty-five million, seven hundred twenty thousand, four hundred thirty-seven".