91198947 has 12 divisors (see below), whose sum is σ = 141451656. Its totient is φ = 52113600.

The previous prime is 91198937. The next prime is 91198949. The reversal of 91198947 is 74989119.

It is not a de Polignac number, because 91198947 - 2⁷ = 91198819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91198896 and 91198905.

It is not an unprimeable number, because it can be changed into a prime (91198949) 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 11 ways as a sum of consecutive naturals, for example, 310054 + ... + 310347.

It is an arithmetic number, because the mean of its divisors is an integer number (11787638).

Almost surely, 2^91198947 is an apocalyptic number.

91198947 is a deficient number, since it is larger than the sum of its proper divisors (50252709).

91198947 is a wasteful number, since it uses less digits than its factorization.

91198947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620418 (or 620411 counting only the distinct ones).

The product of its digits is 163296, while the sum is 48.

The square root of 91198947 is about 9549.8139772458. The cubic root of 91198947 is about 450.1216905458.

The spelling of 91198947 in words is "ninety-one million, one hundred ninety-eight thousand, nine hundred forty-seven".