135220144 has 10 divisors (see below), whose sum is σ = 261989060. Its totient is φ = 67610064.

The previous prime is 135220133. The next prime is 135220147. The reversal of 135220144 is 441022531.

It is not an unprimeable number, because it can be changed into a prime (135220147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4225614 + ... + 4225645.

It is an arithmetic number, because the mean of its divisors is an integer number (26198906).

Almost surely, 2^135220144 is an apocalyptic number.

It is an amenable number.

135220144 is a deficient number, since it is larger than the sum of its proper divisors (126768916).

135220144 is an equidigital number, since it uses as much as digits as its factorization.

135220144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8451267 (or 8451261 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 135220144 is about 11628.4196690694. The cubic root of 135220144 is about 513.2714777139.

Adding to 135220144 its reverse (441022531), we get a palindrome (576242675).

The spelling of 135220144 in words is "one hundred thirty-five million, two hundred twenty thousand, one hundred forty-four".