1226918697 has 4 divisors (see below), whose sum is σ = 1635891600. Its totient is φ = 817945796.

The previous prime is 1226918687. The next prime is 1226918701. The reversal of 1226918697 is 7968196221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7968196221 = 3 ⋅2656065407.

It is a cyclic number.

It is not a de Polignac number, because 1226918697 - 2¹⁰ = 1226917673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1226918617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204486447 + ... + 204486452.

It is an arithmetic number, because the mean of its divisors is an integer number (408972900).

Almost surely, 2^1226918697 is an apocalyptic number.

It is an amenable number.

1226918697 is a deficient number, since it is larger than the sum of its proper divisors (408972903).

1226918697 is an equidigital number, since it uses as much as digits as its factorization.

1226918697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408972902.

The product of its digits is 653184, while the sum is 51.

The square root of 1226918697 is about 35027.3992326008. The cubic root of 1226918697 is about 1070.5458236536.

The spelling of 1226918697 in words is "one billion, two hundred twenty-six million, nine hundred eighteen thousand, six hundred ninety-seven".