1213052231 has 4 divisors (see below), whose sum is σ = 1241262792. Its totient is φ = 1184841672.

The previous prime is 1213052201. The next prime is 1213052249. The reversal of 1213052231 is 1322503121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1322503121 = 31 ⋅42661391.

It is a cyclic number.

It is not a de Polignac number, because 1213052231 - 2⁶ = 1213052167 is a prime.

It is a super-2 number, since 2×1213052231² = 2942991430268154722, 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 (1213052201) 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, 14105216 + ... + 14105301.

It is an arithmetic number, because the mean of its divisors is an integer number (310315698).

Almost surely, 2^1213052231 is an apocalyptic number.

1213052231 is a deficient number, since it is larger than the sum of its proper divisors (28210561).

1213052231 is an equidigital number, since it uses as much as digits as its factorization.

1213052231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28210560.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1213052231 is about 34828.8993653259. The cubic root of 1213052231 is about 1066.4974800782.

Adding to 1213052231 its reverse (1322503121), we get a palindrome (2535555352).

The spelling of 1213052231 in words is "one billion, two hundred thirteen million, fifty-two thousand, two hundred thirty-one".