312740881 has 2 divisors, whose sum is σ = 312740882. Its totient is φ = 312740880.

The previous prime is 312740861. The next prime is 312740899. The reversal of 312740881 is 188047213.

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., 215619856 + 97121025 = 14684^2 + 9855^2 .

It is a cyclic number.

It is not a de Polignac number, because 312740881 - 2²³ = 304352273 is a prime.

It is a super-2 number, since 2×312740881² = 195613717297312322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312740861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156370440 + 156370441.

It is an arithmetic number, because the mean of its divisors is an integer number (156370441).

Almost surely, 2^312740881 is an apocalyptic number.

It is an amenable number.

312740881 is a deficient number, since it is larger than the sum of its proper divisors (1).

312740881 is an equidigital number, since it uses as much as digits as its factorization.

312740881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 312740881 is about 17684.4813607864. The cubic root of 312740881 is about 678.7787198024.

The spelling of 312740881 in words is "three hundred twelve million, seven hundred forty thousand, eight hundred eighty-one".