1211206413 has 8 divisors (see below), whose sum is σ = 1652498848. Its totient is φ = 788692464.

The previous prime is 1211206333. The next prime is 1211206417. The reversal of 1211206413 is 3146021121.

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

It is not a de Polignac number, because 1211206413 - 2¹⁸ = 1210944269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211206413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211206417) 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, 4694470 + ... + 4694727.

It is an arithmetic number, because the mean of its divisors is an integer number (206562356).

Almost surely, 2^1211206413 is an apocalyptic number.

It is an amenable number.

1211206413 is a deficient number, since it is larger than the sum of its proper divisors (441292435).

1211206413 is an equidigital number, since it uses as much as digits as its factorization.

1211206413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9389243.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1211206413 is about 34802.3909092465. The cubic root of 1211206413 is about 1065.9562668986.

Adding to 1211206413 its reverse (3146021121), we get a palindrome (4357227534).

The spelling of 1211206413 in words is "one billion, two hundred eleven million, two hundred six thousand, four hundred thirteen".