1101997291 has 2 divisors, whose sum is σ = 1101997292. Its totient is φ = 1101997290.

The previous prime is 1101997277. The next prime is 1101997333. The reversal of 1101997291 is 1927991011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1101997291 - 2¹³ = 1101989099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1101997231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550998645 + 550998646.

It is an arithmetic number, because the mean of its divisors is an integer number (550998646).

Almost surely, 2^1101997291 is an apocalyptic number.

1101997291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101997291 is an equidigital number, since it uses as much as digits as its factorization.

1101997291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 40.

The square root of 1101997291 is about 33196.3445427354. The cubic root of 1101997291 is about 1032.9045146018.

The spelling of 1101997291 in words is "one billion, one hundred one million, nine hundred ninety-seven thousand, two hundred ninety-one".