1212631223 has 4 divisors (see below), whose sum is σ = 1229710608. Its totient is φ = 1195551840.

The previous prime is 1212631219. The next prime is 1212631271. The reversal of 1212631223 is 3221362121.

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 1212631223 - 2² = 1212631219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212631423) 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, 8539586 + ... + 8539727.

It is an arithmetic number, because the mean of its divisors is an integer number (307427652).

Almost surely, 2^1212631223 is an apocalyptic number.

1212631223 is a deficient number, since it is larger than the sum of its proper divisors (17079385).

1212631223 is an equidigital number, since it uses as much as digits as its factorization.

1212631223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17079384.

The product of its digits is 864, while the sum is 23.

The square root of 1212631223 is about 34822.8548944511. The cubic root of 1212631223 is about 1066.3740844777.

Adding to 1212631223 its reverse (3221362121), we get a palindrome (4433993344).

The spelling of 1212631223 in words is "one billion, two hundred twelve million, six hundred thirty-one thousand, two hundred twenty-three".