91009557641 has 8 divisors (see below), whose sum is σ = 91672916160. Its totient is φ = 90346322448.

The previous prime is 91009557607. The next prime is 91009557689. The reversal of 91009557641 is 14675590019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91009557641 - 2³⁰ = 89935815817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91009550641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1878575 + ... + 1926411.

It is an arithmetic number, because the mean of its divisors is an integer number (11459114520).

Almost surely, 2^91009557641 is an apocalyptic number.

It is an amenable number.

91009557641 is a deficient number, since it is larger than the sum of its proper divisors (663358519).

91009557641 is a wasteful number, since it uses less digits than its factorization.

91009557641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61663.

The product of its (nonzero) digits is 340200, while the sum is 47.

The spelling of 91009557641 in words is "ninety-one billion, nine million, five hundred fifty-seven thousand, six hundred forty-one".