31648129081 has 2 divisors, whose sum is σ = 31648129082. Its totient is φ = 31648129080.

The previous prime is 31648129061. The next prime is 31648129127. The reversal of 31648129081 is 18092184613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16207581481 + 15440547600 = 127309^2 + 124260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31648129081 is a prime.

It is a super-2 number, since 2×31648129081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31648129061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15824064540 + 15824064541.

It is an arithmetic number, because the mean of its divisors is an integer number (15824064541).

Almost surely, 2^31648129081 is an apocalyptic number.

It is an amenable number.

31648129081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31648129081 is an equidigital number, since it uses as much as digits as its factorization.

31648129081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 31648129081 in words is "thirty-one billion, six hundred forty-eight million, one hundred twenty-nine thousand, eighty-one".