91938147 has 8 divisors (see below), whose sum is σ = 140096256. Its totient is φ = 52536072.

The previous prime is 91938089. The next prime is 91938151. The reversal of 91938147 is 74183919.

It is a happy number.

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

It is not a de Polignac number, because 91938147 - 2⁷ = 91938019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91938099 and 91938108.

It is not an unprimeable number, because it can be changed into a prime (91938047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2188983 + ... + 2189024.

It is an arithmetic number, because the mean of its divisors is an integer number (17512032).

Almost surely, 2^91938147 is an apocalyptic number.

91938147 is a deficient number, since it is larger than the sum of its proper divisors (48158109).

91938147 is a wasteful number, since it uses less digits than its factorization.

91938147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378017.

The product of its digits is 54432, while the sum is 42.

The square root of 91938147 is about 9588.4381939918. The cubic root of 91938147 is about 451.3345518264.

The spelling of 91938147 in words is "ninety-one million, nine hundred thirty-eight thousand, one hundred forty-seven".