91431293 has 2 divisors, whose sum is σ = 91431294. Its totient is φ = 91431292.

The previous prime is 91431289. The next prime is 91431313. The reversal of 91431293 is 39213419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47844889 + 43586404 = 6917^2 + 6602^2 .

It is a cyclic number.

It is not a de Polignac number, because 91431293 - 2² = 91431289 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91431283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45715646 + 45715647.

It is an arithmetic number, because the mean of its divisors is an integer number (45715647).

Almost surely, 2^91431293 is an apocalyptic number.

It is an amenable number.

91431293 is a deficient number, since it is larger than the sum of its proper divisors (1).

91431293 is an equidigital number, since it uses as much as digits as its factorization.

91431293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 91431293 is about 9561.9711879926. The cubic root of 91431293 is about 450.5036221640.

The spelling of 91431293 in words is "ninety-one million, four hundred thirty-one thousand, two hundred ninety-three".