135404445491 has 16 divisors (see below), whose sum is σ = 160888304640. Its totient is φ = 111540179520.

The previous prime is 135404445487. The next prime is 135404445523. The reversal of 135404445491 is 194544404531.

It is not a de Polignac number, because 135404445491 - 2² = 135404445487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135404445481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3501611 + ... + 3540068.

It is an arithmetic number, because the mean of its divisors is an integer number (10055519040).

Almost surely, 2^135404445491 is an apocalyptic number.

135404445491 is a deficient number, since it is larger than the sum of its proper divisors (25483859149).

135404445491 is an equidigital number, since it uses as much as digits as its factorization.

135404445491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041794.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 135404445491 in words is "one hundred thirty-five billion, four hundred four million, four hundred forty-five thousand, four hundred ninety-one".