1222312313 has 4 divisors (see below), whose sum is σ = 1286644560. Its totient is φ = 1157980068.

The previous prime is 1222312277. The next prime is 1222312319. The reversal of 1222312313 is 3132132221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3132132221 = 487 ⋅6431483.

It is a cyclic number.

It is not a de Polignac number, because 1222312313 - 2¹⁰ = 1222311289 is a prime.

It is a super-2 number, since 2×1222312313² = 2988094781022819938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222312319) 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, 32166095 + ... + 32166132.

It is an arithmetic number, because the mean of its divisors is an integer number (321661140).

Almost surely, 2^1222312313 is an apocalyptic number.

It is an amenable number.

1222312313 is a deficient number, since it is larger than the sum of its proper divisors (64332247).

1222312313 is an equidigital number, since it uses as much as digits as its factorization.

1222312313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64332246.

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

The square root of 1222312313 is about 34961.5833880561. The cubic root of 1222312313 is about 1069.2043792861.

Adding to 1222312313 its reverse (3132132221), we get a palindrome (4354444534).

The spelling of 1222312313 in words is "one billion, two hundred twenty-two million, three hundred twelve thousand, three hundred thirteen".