1226916997 has 2 divisors, whose sum is σ = 1226916998. Its totient is φ = 1226916996.

The previous prime is 1226916983. The next prime is 1226917051. The reversal of 1226916997 is 7996196221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1150634241 + 76282756 = 33921^2 + 8734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226916997 - 2¹⁹ = 1226392709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226916907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613458498 + 613458499.

It is an arithmetic number, because the mean of its divisors is an integer number (613458499).

Almost surely, 2^1226916997 is an apocalyptic number.

It is an amenable number.

1226916997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226916997 is an equidigital number, since it uses as much as digits as its factorization.

1226916997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 1226916997 is about 35027.3749658749. The cubic root of 1226916997 is about 1070.5453292094.

The spelling of 1226916997 in words is "one billion, two hundred twenty-six million, nine hundred sixteen thousand, nine hundred ninety-seven".