91124447 has 2 divisors, whose sum is σ = 91124448. Its totient is φ = 91124446.

The previous prime is 91124441. The next prime is 91124461. The reversal of 91124447 is 74442119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91124447 - 2⁴ = 91124431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91124441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45562223 + 45562224.

It is an arithmetic number, because the mean of its divisors is an integer number (45562224).

Almost surely, 2^91124447 is an apocalyptic number.

91124447 is a deficient number, since it is larger than the sum of its proper divisors (1).

91124447 is an equidigital number, since it uses as much as digits as its factorization.

91124447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 91124447 is about 9545.9125807856. The cubic root of 91124447 is about 449.9990897101. Note that the first 3 decimals are identical.

The spelling of 91124447 in words is "ninety-one million, one hundred twenty-four thousand, four hundred forty-seven".