91784692946 has 4 divisors (see below), whose sum is σ = 137677039422. Its totient is φ = 45892346472.

The previous prime is 91784692943. The next prime is 91784692969. The reversal of 91784692946 is 64929648719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64929648719 = 13 ⋅4994588363.

It can be written as a sum of positive squares in only one way, i.e., 74441119921 + 17343573025 = 272839^2 + 131695^2 .

It is not an unprimeable number, because it can be changed into a prime (91784692943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22946173235 + ... + 22946173238.

Almost surely, 2^91784692946 is an apocalyptic number.

91784692946 is a deficient number, since it is larger than the sum of its proper divisors (45892346476).

91784692946 is a wasteful number, since it uses less digits than its factorization.

91784692946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45892346475.

The product of its digits is 47029248, while the sum is 65.

The spelling of 91784692946 in words is "ninety-one billion, seven hundred eighty-four million, six hundred ninety-two thousand, nine hundred forty-six".