91431307 has 16 divisors (see below), whose sum is σ = 104924160. Its totient is φ = 78904800.

The previous prime is 91431293. The next prime is 91431313. The reversal of 91431307 is 70313419.

It is a cyclic number.

It is not a de Polignac number, because 91431307 - 2¹¹ = 91429259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91431337) 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, 15544 + ... + 20602.

It is an arithmetic number, because the mean of its divisors is an integer number (6557760).

Almost surely, 2^91431307 is an apocalyptic number.

91431307 is a deficient number, since it is larger than the sum of its proper divisors (13492853).

91431307 is a wasteful number, since it uses less digits than its factorization.

91431307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5154.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 91431307 is about 9561.9719200592. The cubic root of 91431307 is about 450.5036451578.

The spelling of 91431307 in words is "ninety-one million, four hundred thirty-one thousand, three hundred seven".