312013222981 has 2 divisors, whose sum is σ = 312013222982. Its totient is φ = 312013222980.

The previous prime is 312013222967. The next prime is 312013223021. The reversal of 312013222981 is 189222310213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289772273025 + 22240949956 = 538305^2 + 149134^2 .

It is a cyclic number.

It is not a de Polignac number, because 312013222981 - 2¹⁹ = 312012698693 is a prime.

It is a super-2 number, since 2×312013222981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312013222681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156006611490 + 156006611491.

It is an arithmetic number, because the mean of its divisors is an integer number (156006611491).

Almost surely, 2^312013222981 is an apocalyptic number.

It is an amenable number.

312013222981 is a deficient number, since it is larger than the sum of its proper divisors (1).

312013222981 is an equidigital number, since it uses as much as digits as its factorization.

312013222981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 312013222981 in words is "three hundred twelve billion, thirteen million, two hundred twenty-two thousand, nine hundred eighty-one".