11222091997 has 2 divisors, whose sum is σ = 11222091998. Its totient is φ = 11222091996.

The previous prime is 11222091953. The next prime is 11222092009. The reversal of 11222091997 is 79919022211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8012756196 + 3209335801 = 89514^2 + 56651^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222091997 - 2¹⁵ = 11222059229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11222098997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611045998 + 5611045999.

It is an arithmetic number, because the mean of its divisors is an integer number (5611045999).

Almost surely, 2^11222091997 is an apocalyptic number.

It is an amenable number.

11222091997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222091997 is an equidigital number, since it uses as much as digits as its factorization.

11222091997 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 43.

The spelling of 11222091997 in words is "eleven billion, two hundred twenty-two million, ninety-one thousand, nine hundred ninety-seven".