1221432997 has 2 divisors, whose sum is σ = 1221432998. Its totient is φ = 1221432996.

The previous prime is 1221432973. The next prime is 1221433027. The reversal of 1221432997 is 7992341221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177793761 + 43639236 = 34319^2 + 6606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221432997 - 2¹⁹ = 1220908709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221432397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610716498 + 610716499.

It is an arithmetic number, because the mean of its divisors is an integer number (610716499).

Almost surely, 2^1221432997 is an apocalyptic number.

It is an amenable number.

1221432997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221432997 is an equidigital number, since it uses as much as digits as its factorization.

1221432997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 1221432997 is about 34949.0056653977. The cubic root of 1221432997 is about 1068.9479270831.

The spelling of 1221432997 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, nine hundred ninety-seven".