135720997 has 2 divisors, whose sum is σ = 135720998. Its totient is φ = 135720996.

The previous prime is 135720989. The next prime is 135721031. The reversal of 135720997 is 799027531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131583841 + 4137156 = 11471^2 + 2034^2 .

It is a cyclic number.

It is not a de Polignac number, because 135720997 - 2³ = 135720989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135720917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67860498 + 67860499.

It is an arithmetic number, because the mean of its divisors is an integer number (67860499).

Almost surely, 2^135720997 is an apocalyptic number.

It is an amenable number.

135720997 is a deficient number, since it is larger than the sum of its proper divisors (1).

135720997 is an equidigital number, since it uses as much as digits as its factorization.

135720997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 135720997 is about 11649.9354933836. The cubic root of 135720997 is about 513.9044130265.

The spelling of 135720997 in words is "one hundred thirty-five million, seven hundred twenty thousand, nine hundred ninety-seven".