91009544446 has 4 divisors (see below), whose sum is σ = 136514316672. Its totient is φ = 45504772222.

The previous prime is 91009544413. The next prime is 91009544453. The reversal of 91009544446 is 64444590019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64444590019 = 73 ⋅882802603.

It is a junction number, because it is equal to n+sod(n) for n = 91009544396 and 91009544405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22752386110 + ... + 22752386113.

It is an arithmetic number, because the mean of its divisors is an integer number (34128579168).

Almost surely, 2^91009544446 is an apocalyptic number.

91009544446 is a deficient number, since it is larger than the sum of its proper divisors (45504772226).

91009544446 is a wasteful number, since it uses less digits than its factorization.

91009544446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45504772225.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 91009544446 in words is "ninety-one billion, nine million, five hundred forty-four thousand, four hundred forty-six".