91211011147 has 2 divisors, whose sum is σ = 91211011148. Its totient is φ = 91211011146.

The previous prime is 91211011141. The next prime is 91211011231. The reversal of 91211011147 is 74111011219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91211011147 - 2³ = 91211011139 is a prime.

It is not a weakly prime, because it can be changed into another prime (91211011141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45605505573 + 45605505574.

It is an arithmetic number, because the mean of its divisors is an integer number (45605505574).

Almost surely, 2^91211011147 is an apocalyptic number.

91211011147 is a deficient number, since it is larger than the sum of its proper divisors (1).

91211011147 is an equidigital number, since it uses as much as digits as its factorization.

91211011147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 28.

The spelling of 91211011147 in words is "ninety-one billion, two hundred eleven million, eleven thousand, one hundred forty-seven".