91000909247 has 2 divisors, whose sum is σ = 91000909248. Its totient is φ = 91000909246.

The previous prime is 91000909183. The next prime is 91000909277. The reversal of 91000909247 is 74290900019.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91000909247 - 2⁶ = 91000909183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91000909277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500454623 + 45500454624.

It is an arithmetic number, because the mean of its divisors is an integer number (45500454624).

Almost surely, 2^91000909247 is an apocalyptic number.

91000909247 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000909247 is an equidigital number, since it uses as much as digits as its factorization.

91000909247 is an evil number, because the sum of its binary digits is even.

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

The spelling of 91000909247 in words is "ninety-one billion, nine hundred nine thousand, two hundred forty-seven".