1213565399 has 8 divisors (see below), whose sum is σ = 1278869472. Its totient is φ = 1149306400.

The previous prime is 1213565369. The next prime is 1213565429. The reversal of 1213565399 is 9935653121.

It is an interprime number because it is at equal distance from previous prime (1213565369) and next prime (1213565429).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213565399 - 2¹⁶ = 1213499863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213565329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258884 + ... + 263529.

It is an arithmetic number, because the mean of its divisors is an integer number (159858684).

Almost surely, 2^1213565399 is an apocalyptic number.

1213565399 is a deficient number, since it is larger than the sum of its proper divisors (65304073).

1213565399 is a wasteful number, since it uses less digits than its factorization.

1213565399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522537.

The product of its digits is 218700, while the sum is 44.

The square root of 1213565399 is about 34836.2655719582. The cubic root of 1213565399 is about 1066.6478487674.

The spelling of 1213565399 in words is "one billion, two hundred thirteen million, five hundred sixty-five thousand, three hundred ninety-nine".