1213001331 has 4 divisors (see below), whose sum is σ = 1617335112. Its totient is φ = 808667552.

The previous prime is 1213001281. The next prime is 1213001353. The reversal of 1213001331 is 1331003121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213001331 - 2⁶ = 1213001267 is a prime.

It is a super-2 number, since 2×1213001331² = 2942744458015543122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213001331.

It is not an unprimeable number, because it can be changed into a prime (1213001131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202166886 + ... + 202166891.

It is an arithmetic number, because the mean of its divisors is an integer number (404333778).

Almost surely, 2^1213001331 is an apocalyptic number.

1213001331 is a deficient number, since it is larger than the sum of its proper divisors (404333781).

1213001331 is an equidigital number, since it uses as much as digits as its factorization.

1213001331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404333780.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1213001331 is about 34828.1686426375. The cubic root of 1213001331 is about 1066.4825630286.

Adding to 1213001331 its reverse (1331003121), we get a palindrome (2544004452).

The spelling of 1213001331 in words is "one billion, two hundred thirteen million, one thousand, three hundred thirty-one".