312521222762381 has 2 divisors, whose sum is σ = 312521222762382. Its totient is φ = 312521222762380.

The previous prime is 312521222762341. The next prime is 312521222762387. The reversal of 312521222762381 is 183267222125213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241085679440356 + 71435543322025 = 15526934^2 + 8451955^2 .

It is a cyclic number.

It is not a de Polignac number, because 312521222762381 - 2⁴⁶ = 242152478584717 is a prime.

It is a super-2 number, since 2×312521222762381² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312521222762387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156260611381190 + 156260611381191.

It is an arithmetic number, because the mean of its divisors is an integer number (156260611381191).

Almost surely, 2^{312521222762381} is an apocalyptic number.

It is an amenable number.

312521222762381 is a deficient number, since it is larger than the sum of its proper divisors (1).

312521222762381 is an equidigital number, since it uses as much as digits as its factorization.

312521222762381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 47.

Adding to 312521222762381 its reverse (183267222125213), we get a palindrome (495788444887594).

The spelling of 312521222762381 in words is "three hundred twelve trillion, five hundred twenty-one billion, two hundred twenty-two million, seven hundred sixty-two thousand, three hundred eighty-one".