9198881291 has 2 divisors, whose sum is σ = 9198881292. Its totient is φ = 9198881290.

The previous prime is 9198881273. The next prime is 9198881371. The reversal of 9198881291 is 1921888919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9198881291 - 2⁶ = 9198881227 is a prime.

It is not a weakly prime, because it can be changed into another prime (9198881201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4599440645 + 4599440646.

It is an arithmetic number, because the mean of its divisors is an integer number (4599440646).

Almost surely, 2^9198881291 is an apocalyptic number.

9198881291 is a deficient number, since it is larger than the sum of its proper divisors (1).

9198881291 is an equidigital number, since it uses as much as digits as its factorization.

9198881291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 56.

The square root of 9198881291 is about 95910.7986151716. The cubic root of 9198881291 is about 2095.2941710359.

The spelling of 9198881291 in words is "nine billion, one hundred ninety-eight million, eight hundred eighty-one thousand, two hundred ninety-one".