1011220997 has 2 divisors, whose sum is σ = 1011220998. Its totient is φ = 1011220996.

The previous prime is 1011220957. The next prime is 1011221011. The reversal of 1011220997 is 7990221101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 968827876 + 42393121 = 31126^2 + 6511^2 .

It is an emirp because it is prime and its reverse (7990221101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011220997 - 2²⁶ = 944112133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011220927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610498 + 505610499.

It is an arithmetic number, because the mean of its divisors is an integer number (505610499).

Almost surely, 2^1011220997 is an apocalyptic number.

It is an amenable number.

1011220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011220997 is an equidigital number, since it uses as much as digits as its factorization.

1011220997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 1011220997 is about 31799.7012092881. The cubic root of 1011220997 is about 1003.7264288129.

The spelling of 1011220997 in words is "one billion, eleven million, two hundred twenty thousand, nine hundred ninety-seven".