135420001 has 4 divisors (see below), whose sum is σ = 135444400. Its totient is φ = 135395604.

The previous prime is 135419989. The next prime is 135420013. The reversal of 135420001 is 100024531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100024531 = 19 ⋅5264449.

It is an interprime number because it is at equal distance from previous prime (135419989) and next prime (135420013).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135420001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135420031) 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, 610 + ... + 16468.

It is an arithmetic number, because the mean of its divisors is an integer number (33861100).

Almost surely, 2^135420001 is an apocalyptic number.

It is an amenable number.

135420001 is a deficient number, since it is larger than the sum of its proper divisors (24399).

135420001 is an equidigital number, since it uses as much as digits as its factorization.

135420001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24398.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 135420001 is about 11637.0099682006. The cubic root of 135420001 is about 513.5242270394.

Adding to 135420001 its reverse (100024531), we get a palindrome (235444532).

The spelling of 135420001 in words is "one hundred thirty-five million, four hundred twenty thousand, one".