1209813697 has 4 divisors (see below), whose sum is σ = 1210012416. Its totient is φ = 1209614980.

The previous prime is 1209813637. The next prime is 1209813713. The reversal of 1209813697 is 7963189021.

It is a happy number.

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: 7963189021 = 13327 ⋅597523.

It is a cyclic number.

It is not a de Polignac number, because 1209813697 - 2¹¹ = 1209811649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209813637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89929 + ... + 102502.

It is an arithmetic number, because the mean of its divisors is an integer number (302503104).

Almost surely, 2^1209813697 is an apocalyptic number.

It is an amenable number.

1209813697 is a deficient number, since it is larger than the sum of its proper divisors (198719).

1209813697 is an equidigital number, since it uses as much as digits as its factorization.

1209813697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198718.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1209813697 is about 34782.3762414243. The cubic root of 1209813697 is about 1065.5475439062.

The spelling of 1209813697 in words is "one billion, two hundred nine million, eight hundred thirteen thousand, six hundred ninety-seven".