31287648721801 has 6 divisors (see below), whose sum is σ = 33021036463002. Its totient is φ = 29640930367680.

The previous prime is 31287648721789. The next prime is 31287648721811. The reversal of 31287648721801 is 10812784678213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27078504097401 + 4209144624400 = 5203701^2 + 2051620^2 .

It is not a de Polignac number, because 31287648721801 - 2⁷ = 31287648721673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31287648721811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43334693160 + ... + 43334693881.

It is an arithmetic number, because the mean of its divisors is an integer number (5503506077167).

Almost surely, 2^{31287648721801} is an apocalyptic number.

It is an amenable number.

31287648721801 is a deficient number, since it is larger than the sum of its proper divisors (1733387741201).

31287648721801 is an equidigital number, since it uses as much as digits as its factorization.

31287648721801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86669387079 (or 86669387060 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 31287648721801 in words is "thirty-one trillion, two hundred eighty-seven billion, six hundred forty-eight million, seven hundred twenty-one thousand, eight hundred one".