3171487981 has 2 divisors, whose sum is σ = 3171487982. Its totient is φ = 3171487980.

The previous prime is 3171487951. The next prime is 3171487997. The reversal of 3171487981 is 1897841713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3130962025 + 40525956 = 55955^2 + 6366^2 .

It is a cyclic number.

It is not a de Polignac number, because 3171487981 - 2¹³ = 3171479789 is a prime.

It is a super-2 number, since 2×3171487981² = 20116672027254912722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3171487901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1585743990 + 1585743991.

It is an arithmetic number, because the mean of its divisors is an integer number (1585743991).

Almost surely, 2^3171487981 is an apocalyptic number.

It is an amenable number.

3171487981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3171487981 is an equidigital number, since it uses as much as digits as its factorization.

3171487981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 49.

The square root of 3171487981 is about 56315.9655959125. The cubic root of 3171487981 is about 1469.2229037847. Note that the first 3 decimals are identical.

The spelling of 3171487981 in words is "three billion, one hundred seventy-one million, four hundred eighty-seven thousand, nine hundred eighty-one".