91431323 has 2 divisors, whose sum is σ = 91431324. Its totient is φ = 91431322.

The previous prime is 91431313. The next prime is 91431337. The reversal of 91431323 is 32313419.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (32313419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91431323 - 2¹⁶ = 91365787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91431292 and 91431301.

It is not a weakly prime, because it can be changed into another prime (91431313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45715661 + 45715662.

It is an arithmetic number, because the mean of its divisors is an integer number (45715662).

Almost surely, 2^91431323 is an apocalyptic number.

91431323 is a deficient number, since it is larger than the sum of its proper divisors (1).

91431323 is an equidigital number, since it uses as much as digits as its factorization.

91431323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 91431323 is about 9561.9727567066. The cubic root of 91431323 is about 450.5036714364.

The spelling of 91431323 in words is "ninety-one million, four hundred thirty-one thousand, three hundred twenty-three".