135021001 has 4 divisors (see below), whose sum is σ = 135452692. Its totient is φ = 134589312.

The previous prime is 135020959. The next prime is 135021023. The reversal of 135021001 is 100120531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46566976 + 88454025 = 6824^2 + 9405^2 .

It is a cyclic number.

It is not a de Polignac number, because 135021001 - 2¹¹ = 135018953 is a prime.

It is a super-2 number, since 2×135021001² = 36461341422084002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135022001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215376 + ... + 216001.

It is an arithmetic number, because the mean of its divisors is an integer number (33863173).

Almost surely, 2^135021001 is an apocalyptic number.

It is an amenable number.

135021001 is a deficient number, since it is larger than the sum of its proper divisors (431691).

135021001 is an equidigital number, since it uses as much as digits as its factorization.

135021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431690.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 135021001 is about 11619.8537426252. The cubic root of 135021001 is about 513.0193835162.

Adding to 135021001 its reverse (100120531), we get a palindrome (235141532).

The spelling of 135021001 in words is "one hundred thirty-five million, twenty-one thousand, one".