31112032321 has 2 divisors, whose sum is σ = 31112032322. Its totient is φ = 31112032320.

The previous prime is 31112032313. The next prime is 31112032351. The reversal of 31112032321 is 12323021113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23219664400 + 7892367921 = 152380^2 + 88839^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112032321 - 2³ = 31112032313 is a prime.

It is not a weakly prime, because it can be changed into another prime (31112032351) 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 as a sum of consecutive naturals, namely, 15556016160 + 15556016161.

It is an arithmetic number, because the mean of its divisors is an integer number (15556016161).

Almost surely, 2^31112032321 is an apocalyptic number.

It is an amenable number.

31112032321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112032321 is an equidigital number, since it uses as much as digits as its factorization.

31112032321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31112032321 its reverse (12323021113), we get a palindrome (43435053434).

The spelling of 31112032321 in words is "thirty-one billion, one hundred twelve million, thirty-two thousand, three hundred twenty-one".