135770121 has 8 divisors (see below), whose sum is σ = 201140960. Its totient is φ = 90513396.

The previous prime is 135770087. The next prime is 135770137. The reversal of 135770121 is 121077531.

It is a happy number.

It is not a de Polignac number, because 135770121 - 2⁷ = 135769993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5028523 = 135770121 / (1 + 3 + 5 + 7 + 7 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135770161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2514235 + ... + 2514288.

It is an arithmetic number, because the mean of its divisors is an integer number (25142620).

Almost surely, 2^135770121 is an apocalyptic number.

It is an amenable number.

135770121 is a deficient number, since it is larger than the sum of its proper divisors (65370839).

135770121 is an equidigital number, since it uses as much as digits as its factorization.

135770121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028532 (or 5028526 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 135770121 is about 11652.0436404950. The cubic root of 135770121 is about 513.9664078437.

The spelling of 135770121 in words is "one hundred thirty-five million, seven hundred seventy thousand, one hundred twenty-one".