91909091006 has 16 divisors (see below), whose sum is σ = 146817047664. Its totient is φ = 43001326464.

The previous prime is 91909090991. The next prime is 91909091033. The reversal of 91909091006 is 60019090919.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7806860 + ... + 7818623.

It is an arithmetic number, because the mean of its divisors is an integer number (9176065479).

Almost surely, 2^91909091006 is an apocalyptic number.

91909091006 is a deficient number, since it is larger than the sum of its proper divisors (54907956658).

91909091006 is a wasteful number, since it uses less digits than its factorization.

91909091006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15625675.

The product of its (nonzero) digits is 39366, while the sum is 44.

The spelling of 91909091006 in words is "ninety-one billion, nine hundred nine million, ninety-one thousand, six".