91088591447 has 16 divisors (see below), whose sum is σ = 105638184960. Its totient is φ = 76928281632.

The previous prime is 91088591423. The next prime is 91088591509. The reversal of 91088591447 is 74419588019.

It is a cyclic number.

It is not a de Polignac number, because 91088591447 - 2⁶ = 91088591383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91088591392 and 91088591401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91088593447) 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, 6554 + ... + 426872.

It is an arithmetic number, because the mean of its divisors is an integer number (6602386560).

Almost surely, 2^91088591447 is an apocalyptic number.

91088591447 is a deficient number, since it is larger than the sum of its proper divisors (14549593513).

91088591447 is a wasteful number, since it uses less digits than its factorization.

91088591447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420782.

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 91088591447 in words is "ninety-one billion, eighty-eight million, five hundred ninety-one thousand, four hundred forty-seven".