91344731 has 2 divisors, whose sum is σ = 91344732. Its totient is φ = 91344730.

The previous prime is 91344719. The next prime is 91344767. The reversal of 91344731 is 13744319.

It is a weak prime.

It is an emirp because it is prime and its reverse (13744319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91344731 - 2⁶ = 91344667 is a prime.

It is a super-2 number, since 2×91344731² = 16687719762924722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91344131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45672365 + 45672366.

It is an arithmetic number, because the mean of its divisors is an integer number (45672366).

Almost surely, 2^91344731 is an apocalyptic number.

91344731 is a deficient number, since it is larger than the sum of its proper divisors (1).

91344731 is an equidigital number, since it uses as much as digits as its factorization.

91344731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 91344731 is about 9557.4437481996. The cubic root of 91344731 is about 450.3614067864.

The spelling of 91344731 in words is "ninety-one million, three hundred forty-four thousand, seven hundred thirty-one".