1213811201 has 8 divisors (see below), whose sum is σ = 1220016864. Its totient is φ = 1207615680.

The previous prime is 1213811197. The next prime is 1213811213. The reversal of 1213811201 is 1021183121.

It is a happy number.

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 1213811201 - 2² = 1213811197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213811701) 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, 365390 + ... + 368696.

It is an arithmetic number, because the mean of its divisors is an integer number (152502108).

Almost surely, 2^1213811201 is an apocalyptic number.

It is an amenable number.

1213811201 is a deficient number, since it is larger than the sum of its proper divisors (6205663).

1213811201 is a wasteful number, since it uses less digits than its factorization.

1213811201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 1213811201 is about 34839.7933547259. The cubic root of 1213811201 is about 1066.7198587515.

Adding to 1213811201 its reverse (1021183121), we get a palindrome (2234994322).

The spelling of 1213811201 in words is "one billion, two hundred thirteen million, eight hundred eleven thousand, two hundred one".