31980323281 has 2 divisors, whose sum is σ = 31980323282. Its totient is φ = 31980323280.

The previous prime is 31980323269. The next prime is 31980323293. The reversal of 31980323281 is 18232308913.

It is a balanced prime because it is at equal distance from previous prime (31980323269) and next prime (31980323293).

It can be written as a sum of positive squares in only one way, i.e., 31892245056 + 88078225 = 178584^2 + 9385^2 .

It is a cyclic number.

It is not a de Polignac number, because 31980323281 - 2¹³ = 31980315089 is a prime.

It is a super-2 number, since 2×31980323281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31980393281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15990161640 + 15990161641.

It is an arithmetic number, because the mean of its divisors is an integer number (15990161641).

Almost surely, 2^31980323281 is an apocalyptic number.

It is an amenable number.

31980323281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31980323281 is an equidigital number, since it uses as much as digits as its factorization.

31980323281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 31980323281 in words is "thirty-one billion, nine hundred eighty million, three hundred twenty-three thousand, two hundred eighty-one".