11222001997 has 2 divisors, whose sum is σ = 11222001998. Its totient is φ = 11222001996.

The previous prime is 11222001983. The next prime is 11222002007. The reversal of 11222001997 is 79910022211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11032141156 + 189860841 = 105034^2 + 13779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11222001997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11222001697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611000998 + 5611000999.

It is an arithmetic number, because the mean of its divisors is an integer number (5611000999).

Almost surely, 2^11222001997 is an apocalyptic number.

It is an amenable number.

11222001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222001997 is an equidigital number, since it uses as much as digits as its factorization.

11222001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 11222001997 in words is "eleven billion, two hundred twenty-two million, one thousand, nine hundred ninety-seven".