91109643946 has 8 divisors (see below), whose sum is σ = 136748779524. Its totient is φ = 45526717440.

The previous prime is 91109643907. The next prime is 91109643959. The reversal of 91109643946 is 64934690119.

It can be written as a sum of positive squares in 2 ways, for example, as 73070199225 + 18039444721 = 270315^2 + 134311^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 91109643893 and 91109643902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14048215 + ... + 14054698.

Almost surely, 2^91109643946 is an apocalyptic number.

91109643946 is a deficient number, since it is larger than the sum of its proper divisors (45639135578).

91109643946 is a wasteful number, since it uses less digits than its factorization.

91109643946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28104536.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 91109643946 in words is "ninety-one billion, one hundred nine million, six hundred forty-three thousand, nine hundred forty-six".