31440332681 has 2 divisors, whose sum is σ = 31440332682. Its totient is φ = 31440332680.

The previous prime is 31440332653. The next prime is 31440332689. The reversal of 31440332681 is 18623304413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26443963456 + 4996369225 = 162616^2 + 70685^2 .

It is a cyclic number.

It is not a de Polignac number, because 31440332681 - 2⁶ = 31440332617 is a prime.

It is a super-2 number, since 2×31440332681² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31440332689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720166340 + 15720166341.

It is an arithmetic number, because the mean of its divisors is an integer number (15720166341).

Almost surely, 2^31440332681 is an apocalyptic number.

It is an amenable number.

31440332681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440332681 is an equidigital number, since it uses as much as digits as its factorization.

31440332681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 31440332681 in words is "thirty-one billion, four hundred forty million, three hundred thirty-two thousand, six hundred eighty-one".