1213012231 has 4 divisors (see below), whose sum is σ = 1276855000. Its totient is φ = 1149169464.

The previous prime is 1213012223. The next prime is 1213012253. The reversal of 1213012231 is 1322103121.

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 1213012231 - 2³ = 1213012223 is a prime.

It is a super-2 number, since 2×1213012231² = 2942797345111194722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273012231) 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, 31921356 + ... + 31921393.

It is an arithmetic number, because the mean of its divisors is an integer number (319213750).

Almost surely, 2^1213012231 is an apocalyptic number.

1213012231 is a deficient number, since it is larger than the sum of its proper divisors (63842769).

1213012231 is an equidigital number, since it uses as much as digits as its factorization.

1213012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63842768.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1213012231 is about 34828.3251248176. The cubic root of 1213012231 is about 1066.4857574810.

Adding to 1213012231 its reverse (1322103121), we get a palindrome (2535115352).

The spelling of 1213012231 in words is "one billion, two hundred thirteen million, twelve thousand, two hundred thirty-one".