1213013201 has 4 divisors (see below), whose sum is σ = 1220025012. Its totient is φ = 1206001392.

The previous prime is 1213013161. The next prime is 1213013209. The reversal of 1213013201 is 1023103121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 460059601 + 752953600 = 21449^2 + 27440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213013201 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 (1213013209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505646 + ... + 3505991.

It is an arithmetic number, because the mean of its divisors is an integer number (305006253).

Almost surely, 2^1213013201 is an apocalyptic number.

It is an amenable number.

1213013201 is a deficient number, since it is larger than the sum of its proper divisors (7011811).

1213013201 is an equidigital number, since it uses as much as digits as its factorization.

1213013201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011810.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1213013201 is about 34828.3390502619. The cubic root of 1213013201 is about 1066.4860417570.

Adding to 1213013201 its reverse (1023103121), we get a palindrome (2236116322).

The spelling of 1213013201 in words is "one billion, two hundred thirteen million, thirteen thousand, two hundred one".