1111021997 has 2 divisors, whose sum is σ = 1111021998. Its totient is φ = 1111021996.

The previous prime is 1111021993. The next prime is 1111022009. The reversal of 1111021997 is 7991201111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1038192841 + 72829156 = 32221^2 + 8534^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111021997 - 2² = 1111021993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111021991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555510998 + 555510999.

It is an arithmetic number, because the mean of its divisors is an integer number (555510999).

Almost surely, 2^1111021997 is an apocalyptic number.

It is an amenable number.

1111021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111021997 is an equidigital number, since it uses as much as digits as its factorization.

1111021997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 32.

The square root of 1111021997 is about 33331.9965948636. The cubic root of 1111021997 is about 1035.7164780847.

The spelling of 1111021997 in words is "one billion, one hundred eleven million, twenty-one thousand, nine hundred ninety-seven".