91499397 has 8 divisors (see below), whose sum is σ = 133090080. Its totient is φ = 55454160.

The previous prime is 91499393. The next prime is 91499411. The reversal of 91499397 is 79399419.

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

It is not a de Polignac number, because 91499397 - 2² = 91499393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91499393) 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 7 ways as a sum of consecutive naturals, for example, 1386322 + ... + 1386387.

It is an arithmetic number, because the mean of its divisors is an integer number (16636260).

Almost surely, 2^91499397 is an apocalyptic number.

It is an amenable number.

91499397 is a deficient number, since it is larger than the sum of its proper divisors (41590683).

91499397 is a wasteful number, since it uses less digits than its factorization.

91499397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772723.

The product of its digits is 551124, while the sum is 51.

The square root of 91499397 is about 9565.5317154876. The cubic root of 91499397 is about 450.6154492459.

The spelling of 91499397 in words is "ninety-one million, four hundred ninety-nine thousand, three hundred ninety-seven".