91010009091 has 8 divisors (see below), whose sum is σ = 126622621440. Its totient is φ = 58035368072.

The previous prime is 91010009081. The next prime is 91010009107. The reversal of 91010009091 is 19090001019.

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 91010009091 - 2⁵ = 91010009059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91010009081) 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, 659492751 + ... + 659492888.

It is an arithmetic number, because the mean of its divisors is an integer number (15827827680).

Almost surely, 2^91010009091 is an apocalyptic number.

91010009091 is a deficient number, since it is larger than the sum of its proper divisors (35612612349).

91010009091 is a wasteful number, since it uses less digits than its factorization.

91010009091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318985665.

The product of its (nonzero) digits is 729, while the sum is 30.

The spelling of 91010009091 in words is "ninety-one billion, ten million, nine thousand, ninety-one".