1221168097 has 2 divisors, whose sum is σ = 1221168098. Its totient is φ = 1221168096.

The previous prime is 1221168059. The next prime is 1221168161. The reversal of 1221168097 is 7908611221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852873616 + 368294481 = 29204^2 + 19191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221168097 - 2¹⁵ = 1221135329 is a prime.

It is a super-2 number, since 2×1221168097² = 2982503042261202818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221168007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610584048 + 610584049.

It is an arithmetic number, because the mean of its divisors is an integer number (610584049).

Almost surely, 2^1221168097 is an apocalyptic number.

It is an amenable number.

1221168097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221168097 is an equidigital number, since it uses as much as digits as its factorization.

1221168097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1221168097 is about 34945.2156525038. The cubic root of 1221168097 is about 1068.8706449673.

It can be divided in two parts, 12211 and 68097, that added together give a palindrome (80308).

The spelling of 1221168097 in words is "one billion, two hundred twenty-one million, one hundred sixty-eight thousand, ninety-seven".