91740488249 has 2 divisors, whose sum is σ = 91740488250. Its totient is φ = 91740488248.

The previous prime is 91740488243. The next prime is 91740488297. The reversal of 91740488249 is 94288404719.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76691332624 + 15049155625 = 276932^2 + 122675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91740488249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91740488194 and 91740488203.

It is not a weakly prime, because it can be changed into another prime (91740488243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45870244124 + 45870244125.

It is an arithmetic number, because the mean of its divisors is an integer number (45870244125).

Almost surely, 2^91740488249 is an apocalyptic number.

It is an amenable number.

91740488249 is a deficient number, since it is larger than the sum of its proper divisors (1).

91740488249 is an equidigital number, since it uses as much as digits as its factorization.

91740488249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 91740488249 in words is "ninety-one billion, seven hundred forty million, four hundred eighty-eight thousand, two hundred forty-nine".