1221262697 has 2 divisors, whose sum is σ = 1221262698. Its totient is φ = 1221262696.

The previous prime is 1221262687. The next prime is 1221262723. The reversal of 1221262697 is 7962621221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1093029721 + 128232976 = 33061^2 + 11324^2 .

It is an emirp because it is prime and its reverse (7962621221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221262697 - 2⁴ = 1221262681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221262697.

It is not a weakly prime, because it can be changed into another prime (1221262687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610631348 + 610631349.

It is an arithmetic number, because the mean of its divisors is an integer number (610631349).

Almost surely, 2^1221262697 is an apocalyptic number.

It is an amenable number.

1221262697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221262697 is an equidigital number, since it uses as much as digits as its factorization.

1221262697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 1221262697 is about 34946.5691735255. The cubic root of 1221262697 is about 1068.8982449219.

The spelling of 1221262697 in words is "one billion, two hundred twenty-one million, two hundred sixty-two thousand, six hundred ninety-seven".