91144394 has 32 divisors (see below), whose sum is σ = 156969792. Its totient is φ = 39312000.

The previous prime is 91144381. The next prime is 91144399. The reversal of 91144394 is 49344119.

It is not an unprimeable number, because it can be changed into a prime (91144399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32009 + ... + 34739.

It is an arithmetic number, because the mean of its divisors is an integer number (4905306).

Almost surely, 2^91144394 is an apocalyptic number.

91144394 is a deficient number, since it is larger than the sum of its proper divisors (65825398).

91144394 is a wasteful number, since it uses less digits than its factorization.

91144394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

The product of its digits is 15552, while the sum is 35.

The square root of 91144394 is about 9546.9573163391. The cubic root of 91144394 is about 450.0319220153.

The spelling of 91144394 in words is "ninety-one million, one hundred forty-four thousand, three hundred ninety-four".