31090280681 has 2 divisors, whose sum is σ = 31090280682. Its totient is φ = 31090280680.

The previous prime is 31090280671. The next prime is 31090280699. The reversal of 31090280681 is 18608209013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29056270681 + 2034010000 = 170459^2 + 45100^2 .

It is a cyclic number.

It is not a de Polignac number, because 31090280681 - 2¹⁸ = 31090018537 is a prime.

It is a super-2 number, since 2×31090280681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31090280671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15545140340 + 15545140341.

It is an arithmetic number, because the mean of its divisors is an integer number (15545140341).

Almost surely, 2^31090280681 is an apocalyptic number.

It is an amenable number.

31090280681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31090280681 is an equidigital number, since it uses as much as digits as its factorization.

31090280681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

Adding to 31090280681 its reverse (18608209013), we get a palindrome (49698489694).

The spelling of 31090280681 in words is "thirty-one billion, ninety million, two hundred eighty thousand, six hundred eighty-one".