1218097469 has 6 divisors (see below), whose sum is σ = 1260295290. Its totient is φ = 1175912640.

The previous prime is 1218097417. The next prime is 1218097483. The reversal of 1218097469 is 9647908121.

It can be written as a sum of positive squares in 3 ways, for example, as 824551225 + 393546244 = 28715^2 + 19838^2 .

It is not a de Polignac number, because 1218097469 - 2⁸ = 1218097213 is a prime.

It is a super-2 number, since 2×1218097469² = 2967522887968411922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218097409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184709 + ... + 191189.

It is an arithmetic number, because the mean of its divisors is an integer number (210049215).

Almost surely, 2^1218097469 is an apocalyptic number.

It is an amenable number.

1218097469 is a deficient number, since it is larger than the sum of its proper divisors (42197821).

1218097469 is an frugal number, since it uses more digits than its factorization.

1218097469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12991 (or 6510 counting only the distinct ones).

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

The square root of 1218097469 is about 34901.2531150387. The cubic root of 1218097469 is about 1067.9740010247.

The spelling of 1218097469 in words is "one billion, two hundred eighteen million, ninety-seven thousand, four hundred sixty-nine".