135997373 has 2 divisors, whose sum is σ = 135997374. Its totient is φ = 135997372.

The previous prime is 135997357. The next prime is 135997387. The reversal of 135997373 is 373799531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76352644 + 59644729 = 8738^2 + 7723^2 .

It is a cyclic number.

It is not a de Polignac number, because 135997373 - 2⁴ = 135997357 is a prime.

It is a super-2 number, since 2×135997373² = 36990570925802258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135997333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67998686 + 67998687.

It is an arithmetic number, because the mean of its divisors is an integer number (67998687).

Almost surely, 2^135997373 is an apocalyptic number.

It is an amenable number.

135997373 is a deficient number, since it is larger than the sum of its proper divisors (1).

135997373 is an equidigital number, since it uses as much as digits as its factorization.

135997373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 535815, while the sum is 47.

The square root of 135997373 is about 11661.7911574509. The cubic root of 135997373 is about 514.2530069551.

The spelling of 135997373 in words is "one hundred thirty-five million, nine hundred ninety-seven thousand, three hundred seventy-three".