91668946 has 4 divisors (see below), whose sum is σ = 137503422. Its totient is φ = 45834472.

The previous prime is 91668923. The next prime is 91669009. The reversal of 91668946 is 64986619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 88153321 + 3515625 = 9389^2 + 1875^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91668946.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22917235 + ... + 22917238.

Almost surely, 2^91668946 is an apocalyptic number.

91668946 is a deficient number, since it is larger than the sum of its proper divisors (45834476).

91668946 is a wasteful number, since it uses less digits than its factorization.

91668946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45834475.

The product of its digits is 559872, while the sum is 49.

The square root of 91668946 is about 9574.3901111246. The cubic root of 91668946 is about 450.8936086621.

The spelling of 91668946 in words is "ninety-one million, six hundred sixty-eight thousand, nine hundred forty-six".