91493642 has 4 divisors (see below), whose sum is σ = 137240466. Its totient is φ = 45746820.

The previous prime is 91493641. The next prime is 91493651. The reversal of 91493642 is 24639419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24639419 = 7 ⋅3519917.

It can be written as a sum of positive squares in only one way, i.e., 79584241 + 11909401 = 8921^2 + 3451^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91493596 and 91493605.

It is not an unprimeable number, because it can be changed into a prime (91493641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22873409 + ... + 22873412.

Almost surely, 2^91493642 is an apocalyptic number.

91493642 is a deficient number, since it is larger than the sum of its proper divisors (45746824).

91493642 is a wasteful number, since it uses less digits than its factorization.

91493642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45746823.

The product of its digits is 46656, while the sum is 38.

The square root of 91493642 is about 9565.2308910972. The cubic root of 91493642 is about 450.6060016562.

The spelling of 91493642 in words is "ninety-one million, four hundred ninety-three thousand, six hundred forty-two".