91409136455 has 32 divisors (see below), whose sum is σ = 136341007488. Its totient is φ = 57286080000.

The previous prime is 91409136449. The next prime is 91409136499. The reversal of 91409136455 is 55463190419.

It is a happy number.

It is not a de Polignac number, because 91409136455 - 2¹⁰ = 91409135431 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 948596 + ... + 1040505.

It is an arithmetic number, because the mean of its divisors is an integer number (4260656484).

Almost surely, 2^91409136455 is an apocalyptic number.

91409136455 is a deficient number, since it is larger than the sum of its proper divisors (44931871033).

91409136455 is a wasteful number, since it uses less digits than its factorization.

91409136455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989227.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 91409136455 in words is "ninety-one billion, four hundred nine million, one hundred thirty-six thousand, four hundred fifty-five".