1212023231 has 4 divisors (see below), whose sum is σ = 1218114000. Its totient is φ = 1205932464.

The previous prime is 1212023191. The next prime is 1212023251. The reversal of 1212023231 is 1323202121.

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 1212023231 - 2¹⁸ = 1211761087 is a prime.

It is a super-2 number, since 2×1212023231² = 2938000624967358722, 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 (1212023251) 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, 3045086 + ... + 3045483.

It is an arithmetic number, because the mean of its divisors is an integer number (304528500).

Almost surely, 2^1212023231 is an apocalyptic number.

1212023231 is a deficient number, since it is larger than the sum of its proper divisors (6090769).

1212023231 is an equidigital number, since it uses as much as digits as its factorization.

1212023231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090768.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1212023231 is about 34814.1240159795. The cubic root of 1212023231 is about 1066.1958342708.

Adding to 1212023231 its reverse (1323202121), we get a palindrome (2535225352).

The spelling of 1212023231 in words is "one billion, two hundred twelve million, twenty-three thousand, two hundred thirty-one".