135206491 has 16 divisors (see below), whose sum is σ = 167422464. Its totient is φ = 106533504.

The previous prime is 135206453. The next prime is 135206501. The reversal of 135206491 is 194602531.

It is not a de Polignac number, because 135206491 - 2²⁷ = 988763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135206431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8095 + ... + 18328.

It is an arithmetic number, because the mean of its divisors is an integer number (10463904).

Almost surely, 2^135206491 is an apocalyptic number.

135206491 is a deficient number, since it is larger than the sum of its proper divisors (32215973).

135206491 is a wasteful number, since it uses less digits than its factorization.

135206491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26490.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 135206491 is about 11627.8326011342. The cubic root of 135206491 is about 513.2542023506.

The spelling of 135206491 in words is "one hundred thirty-five million, two hundred six thousand, four hundred ninety-one".