1226993657 has 2 divisors, whose sum is σ = 1226993658. Its totient is φ = 1226993656.

The previous prime is 1226993653. The next prime is 1226993659. The reversal of 1226993657 is 7563996221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630461881 + 596531776 = 25109^2 + 24424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226993657 - 2² = 1226993653 is a prime.

Together with 1226993659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1226993653) 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, 613496828 + 613496829.

It is an arithmetic number, because the mean of its divisors is an integer number (613496829).

Almost surely, 2^1226993657 is an apocalyptic number.

It is an amenable number.

1226993657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226993657 is an equidigital number, since it uses as much as digits as its factorization.

1226993657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 50.

The square root of 1226993657 is about 35028.4692357517. The cubic root of 1226993657 is about 1070.5676252832.

The spelling of 1226993657 in words is "one billion, two hundred twenty-six million, nine hundred ninety-three thousand, six hundred fifty-seven".