135139397 has 2 divisors, whose sum is σ = 135139398. Its totient is φ = 135139396.

The previous prime is 135139369. The next prime is 135139423. The reversal of 135139397 is 793931531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104325796 + 30813601 = 10214^2 + 5551^2 .

It is a cyclic number.

It is not a de Polignac number, because 135139397 - 2¹⁴ = 135123013 is a prime.

It is equal to p_7652984 and since 135139397 and 7652984 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135139327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67569698 + 67569699.

It is an arithmetic number, because the mean of its divisors is an integer number (67569699).

Almost surely, 2^135139397 is an apocalyptic number.

It is an amenable number.

135139397 is a deficient number, since it is larger than the sum of its proper divisors (1).

135139397 is an equidigital number, since it uses as much as digits as its factorization.

135139397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 41.

The square root of 135139397 is about 11624.9471826757. The cubic root of 135139397 is about 513.1692903149.

The spelling of 135139397 in words is "one hundred thirty-five million, one hundred thirty-nine thousand, three hundred ninety-seven".