31124330681 has 2 divisors, whose sum is σ = 31124330682. Its totient is φ = 31124330680.

The previous prime is 31124330639. The next prime is 31124330717. The reversal of 31124330681 is 18603342113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17267274025 + 13857056656 = 131405^2 + 117716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31124330681 is a prime.

It is a super-2 number, since 2×31124330681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31124330621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562165340 + 15562165341.

It is an arithmetic number, because the mean of its divisors is an integer number (15562165341).

Almost surely, 2^31124330681 is an apocalyptic number.

It is an amenable number.

31124330681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31124330681 is an equidigital number, since it uses as much as digits as its factorization.

31124330681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 31124330681 its reverse (18603342113), we get a palindrome (49727672794).

The spelling of 31124330681 in words is "thirty-one billion, one hundred twenty-four million, three hundred thirty thousand, six hundred eighty-one".