91287479387 has 8 divisors (see below), whose sum is σ = 98701268400. Its totient is φ = 83929644000.

The previous prime is 91287479351. The next prime is 91287479407. The reversal of 91287479387 is 78397478219.

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

It is a cyclic number.

It is not a de Polignac number, because 91287479387 - 2¹² = 91287475291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91287479317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13985012 + ... + 13991537.

It is an arithmetic number, because the mean of its divisors is an integer number (12337658550).

Almost surely, 2^91287479387 is an apocalyptic number.

91287479387 is a deficient number, since it is larger than the sum of its proper divisors (7413789013).

91287479387 is a wasteful number, since it uses less digits than its factorization.

91287479387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27976813.

The product of its digits is 42674688, while the sum is 65.

The spelling of 91287479387 in words is "ninety-one billion, two hundred eighty-seven million, four hundred seventy-nine thousand, three hundred eighty-seven".