135440549 has 2 divisors, whose sum is σ = 135440550. Its totient is φ = 135440548.

The previous prime is 135440521. The next prime is 135440561. The reversal of 135440549 is 945044531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95687524 + 39753025 = 9782^2 + 6305^2 .

It is a cyclic number.

It is not a de Polignac number, because 135440549 - 2¹⁶ = 135375013 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135440509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67720274 + 67720275.

It is an arithmetic number, because the mean of its divisors is an integer number (67720275).

Almost surely, 2^135440549 is an apocalyptic number.

It is an amenable number.

135440549 is a deficient number, since it is larger than the sum of its proper divisors (1).

135440549 is an equidigital number, since it uses as much as digits as its factorization.

135440549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 135440549 is about 11637.8928075490. The cubic root of 135440549 is about 513.5501989837.

The spelling of 135440549 in words is "one hundred thirty-five million, four hundred forty thousand, five hundred forty-nine".