91318739 has 2 divisors, whose sum is σ = 91318740. Its totient is φ = 91318738.

The previous prime is 91318687. The next prime is 91318741. The reversal of 91318739 is 93781319.

It is a strong prime.

It is an emirp because it is prime and its reverse (93781319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91318739 - 2¹⁶ = 91253203 is a prime.

It is a super-2 number, since 2×91318739² = 16678224185100242, which contains 22 as substring.

Together with 91318741, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91318696 and 91318705.

It is not a weakly prime, because it can be changed into another prime (91318639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45659369 + 45659370.

It is an arithmetic number, because the mean of its divisors is an integer number (45659370).

Almost surely, 2^91318739 is an apocalyptic number.

91318739 is a deficient number, since it is larger than the sum of its proper divisors (1).

91318739 is an equidigital number, since it uses as much as digits as its factorization.

91318739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 91318739 is about 9556.0838736378. The cubic root of 91318739 is about 450.3186861900.

The spelling of 91318739 in words is "ninety-one million, three hundred eighteen thousand, seven hundred thirty-nine".