9901443091 has 2 divisors, whose sum is σ = 9901443092. Its totient is φ = 9901443090.

The previous prime is 9901443049. The next prime is 9901443107. The reversal of 9901443091 is 1903441099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9901443091 - 2¹⁷ = 9901312019 is a prime.

It is not a weakly prime, because it can be changed into another prime (9901443011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950721545 + 4950721546.

It is an arithmetic number, because the mean of its divisors is an integer number (4950721546).

Almost surely, 2^9901443091 is an apocalyptic number.

9901443091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901443091 is an equidigital number, since it uses as much as digits as its factorization.

9901443091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 9901443091 is about 99505.9952515425. The cubic root of 9901443091 is about 2147.3334955018. Note that the first 3 decimals are identical.

The spelling of 9901443091 in words is "nine billion, nine hundred one million, four hundred forty-three thousand, ninety-one".