91281398 has 16 divisors (see below), whose sum is σ = 156129120. Its totient is φ = 39651456.

The previous prime is 91281397. The next prime is 91281409. The reversal of 91281398 is 89318219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91281397) 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, 102818 + ... + 103701.

It is an arithmetic number, because the mean of its divisors is an integer number (9758070).

Almost surely, 2^91281398 is an apocalyptic number.

91281398 is a deficient number, since it is larger than the sum of its proper divisors (64847722).

91281398 is a wasteful number, since it uses less digits than its factorization.

91281398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206551.

The product of its digits is 31104, while the sum is 41.

The square root of 91281398 is about 9554.1298923555. The cubic root of 91281398 is about 450.2572981232.

The spelling of 91281398 in words is "ninety-one million, two hundred eighty-one thousand, three hundred ninety-eight".