91574395049 has 2 divisors, whose sum is σ = 91574395050. Its totient is φ = 91574395048.

The previous prime is 91574395039. The next prime is 91574395061. The reversal of 91574395049 is 94059347519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58579489024 + 32994906025 = 242032^2 + 181645^2 .

It is an emirp because it is prime and its reverse (94059347519) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91574395049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91574394985 and 91574395003.

It is not a weakly prime, because it can be changed into another prime (91574395039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45787197524 + 45787197525.

It is an arithmetic number, because the mean of its divisors is an integer number (45787197525).

Almost surely, 2^91574395049 is an apocalyptic number.

It is an amenable number.

91574395049 is a deficient number, since it is larger than the sum of its proper divisors (1).

91574395049 is an equidigital number, since it uses as much as digits as its factorization.

91574395049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6123600, while the sum is 56.

The spelling of 91574395049 in words is "ninety-one billion, five hundred seventy-four million, three hundred ninety-five thousand, forty-nine".