91668842 has 4 divisors (see below), whose sum is σ = 137503266. Its totient is φ = 45834420.

The previous prime is 91668827. The next prime is 91668851. The reversal of 91668842 is 24886619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24886619 = 1579 ⋅15761.

It can be written as a sum of positive squares in only one way, i.e., 46362481 + 45306361 = 6809^2 + 6731^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91668793 and 91668802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22917209 + ... + 22917212.

Almost surely, 2^91668842 is an apocalyptic number.

91668842 is a deficient number, since it is larger than the sum of its proper divisors (45834424).

91668842 is a wasteful number, since it uses less digits than its factorization.

91668842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45834423.

The product of its digits is 165888, while the sum is 44.

The square root of 91668842 is about 9574.3846799677. The cubic root of 91668842 is about 450.8934381465.

The spelling of 91668842 in words is "ninety-one million, six hundred sixty-eight thousand, eight hundred forty-two".