712871981 has 2 divisors, whose sum is σ = 712871982. Its totient is φ = 712871980.

The previous prime is 712871923. The next prime is 712871987. The reversal of 712871981 is 189178217.

712871981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 454755625 + 258116356 = 21325^2 + 16066^2 .

It is a cyclic number.

It is not a de Polignac number, because 712871981 - 2⁶ = 712871917 is a prime.

It is a super-2 number, since 2×712871981² = 1016372922589728722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (712871987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356435990 + 356435991.

It is an arithmetic number, because the mean of its divisors is an integer number (356435991).

Almost surely, 2^712871981 is an apocalyptic number.

It is an amenable number.

712871981 is a deficient number, since it is larger than the sum of its proper divisors (1).

712871981 is an equidigital number, since it uses as much as digits as its factorization.

712871981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 44.

The square root of 712871981 is about 26699.6625634108. The cubic root of 712871981 is about 893.3133997031.

The spelling of 712871981 in words is "seven hundred twelve million, eight hundred seventy-one thousand, nine hundred eighty-one".