312587733681 has 6 divisors (see below), whose sum is σ = 451515615330. Its totient is φ = 208391822448.

The previous prime is 312587733673. The next prime is 312587733691. The reversal of 312587733681 is 186337785213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 263563131456 + 49024602225 = 513384^2 + 221415^2 .

It is not a de Polignac number, because 312587733681 - 2³ = 312587733673 is a prime.

It is a super-2 number, since 2×312587733681² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (312587733691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17365985196 + ... + 17365985213.

It is an arithmetic number, because the mean of its divisors is an integer number (75252602555).

Almost surely, 2^312587733681 is an apocalyptic number.

It is an amenable number.

312587733681 is a deficient number, since it is larger than the sum of its proper divisors (138927881649).

312587733681 is a wasteful number, since it uses less digits than its factorization.

312587733681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34731970415 (or 34731970412 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 312587733681 in words is "three hundred twelve billion, five hundred eighty-seven million, seven hundred thirty-three thousand, six hundred eighty-one".