1218904697 has 2 divisors, whose sum is σ = 1218904698. Its totient is φ = 1218904696.

The previous prime is 1218904681. The next prime is 1218904741. The reversal of 1218904697 is 7964098121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866066041 + 352838656 = 29429^2 + 18784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218904697 - 2⁴ = 1218904681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218904637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609452348 + 609452349.

It is an arithmetic number, because the mean of its divisors is an integer number (609452349).

Almost surely, 2^1218904697 is an apocalyptic number.

It is an amenable number.

1218904697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218904697 is an equidigital number, since it uses as much as digits as its factorization.

1218904697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 1218904697 is about 34912.8156555727. The cubic root of 1218904697 is about 1068.2098628700.

The spelling of 1218904697 in words is "one billion, two hundred eighteen million, nine hundred four thousand, six hundred ninety-seven".