91103491 has 4 divisors (see below), whose sum is σ = 91143000. Its totient is φ = 91063984.

The previous prime is 91103479. The next prime is 91103497. The reversal of 91103491 is 19430119.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91103491 - 2¹⁵ = 91070723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91103497) 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 in 3 ways as a sum of consecutive naturals, for example, 16066 + ... + 20983.

It is an arithmetic number, because the mean of its divisors is an integer number (22785750).

Almost surely, 2^91103491 is an apocalyptic number.

91103491 is a deficient number, since it is larger than the sum of its proper divisors (39509).

91103491 is a wasteful number, since it uses less digits than its factorization.

91103491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39508.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 91103491 is about 9544.8148751037. The cubic root of 91103491 is about 449.9645914526.

The spelling of 91103491 in words is "ninety-one million, one hundred three thousand, four hundred ninety-one".