135451906 has 4 divisors (see below), whose sum is σ = 203177862. Its totient is φ = 67725952.

The previous prime is 135451891. The next prime is 135451909. The reversal of 135451906 is 609154531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609154531 = 107 ⋅5693033.

It can be written as a sum of positive squares in only one way, i.e., 107308881 + 28143025 = 10359^2 + 5305^2 .

It is not an unprimeable number, because it can be changed into a prime (135451909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33862975 + ... + 33862978.

Almost surely, 2^135451906 is an apocalyptic number.

135451906 is a deficient number, since it is larger than the sum of its proper divisors (67725956).

135451906 is an equidigital number, since it uses as much as digits as its factorization.

135451906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67725955.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 135451906 is about 11638.3807292939. The cubic root of 135451906 is about 513.5645527023.

It can be divided in two parts, 13545 and 1906, that added together give a palindrome (15451).

The spelling of 135451906 in words is "one hundred thirty-five million, four hundred fifty-one thousand, nine hundred six".