1213013243 has 16 divisors (see below), whose sum is σ = 1336331136. Its totient is φ = 1094221440.

The previous prime is 1213013239. The next prime is 1213013281. The reversal of 1213013243 is 3423103121.

It is not a de Polignac number, because 1213013243 - 2² = 1213013239 is a prime.

It is a super-2 number, since 2×1213013243² = 2942802255386754098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213013293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119630 + ... + 129372.

It is an arithmetic number, because the mean of its divisors is an integer number (83520696).

Almost surely, 2^1213013243 is an apocalyptic number.

1213013243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213013243 is a deficient number, since it is larger than the sum of its proper divisors (123317893).

1213013243 is a wasteful number, since it uses less digits than its factorization.

1213013243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9974.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213013243 is about 34828.3396532192. The cubic root of 1213013243 is about 1066.4860540659.

Adding to 1213013243 its reverse (3423103121), we get a palindrome (4636116364).

The spelling of 1213013243 in words is "one billion, two hundred thirteen million, thirteen thousand, two hundred forty-three".