91912786249 has 2 divisors, whose sum is σ = 91912786250. Its totient is φ = 91912786248.

The previous prime is 91912786247. The next prime is 91912786271. The reversal of 91912786249 is 94268721919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80585015625 + 11327770624 = 283875^2 + 106432^2 .

It is a cyclic number.

It is not a de Polignac number, because 91912786249 - 2¹ = 91912786247 is a prime.

Together with 91912786247, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 91912786193 and 91912786202.

It is not a weakly prime, because it can be changed into another prime (91912786241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45956393124 + 45956393125.

It is an arithmetic number, because the mean of its divisors is an integer number (45956393125).

Almost surely, 2^91912786249 is an apocalyptic number.

It is an amenable number.

91912786249 is a deficient number, since it is larger than the sum of its proper divisors (1).

91912786249 is an equidigital number, since it uses as much as digits as its factorization.

91912786249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The spelling of 91912786249 in words is "ninety-one billion, nine hundred twelve million, seven hundred eighty-six thousand, two hundred forty-nine".