1213001213 has 8 divisors (see below), whose sum is σ = 1226144856. Its totient is φ = 1199880000.

The previous prime is 1213001191. The next prime is 1213001267. The reversal of 1213001213 is 3121003121.

It can be written as a sum of positive squares in 4 ways, for example, as 487614724 + 725386489 = 22082^2 + 26933^2 .

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

It is not a de Polignac number, because 1213001213 - 2¹⁸ = 1212739069 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 (1213000213) 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, 117563 + ... + 127463.

It is an arithmetic number, because the mean of its divisors is an integer number (153268107).

Almost surely, 2^1213001213 is an apocalyptic number.

It is an amenable number.

1213001213 is a deficient number, since it is larger than the sum of its proper divisors (13143643).

1213001213 is a wasteful number, since it uses less digits than its factorization.

1213001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11215.

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

The square root of 1213001213 is about 34828.1669486064. The cubic root of 1213001213 is about 1066.4825284463.

Adding to 1213001213 its reverse (3121003121), we get a palindrome (4334004334).

It can be divided in two parts, 121300 and 1213, that multiplied together give a square (147136900 = 12130²).

The spelling of 1213001213 in words is "one billion, two hundred thirteen million, one thousand, two hundred thirteen".