1715147981 has 2 divisors, whose sum is σ = 1715147982. Its totient is φ = 1715147980.

The previous prime is 1715147971. The next prime is 1715148049. The reversal of 1715147981 is 1897415171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1698264100 + 16883881 = 41210^2 + 4109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1715147981 - 2²⁶ = 1648039117 is a prime.

It is a super-2 number, since 2×1715147981² = 5883465193456752722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1715147971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 857573990 + 857573991.

It is an arithmetic number, because the mean of its divisors is an integer number (857573991).

Almost surely, 2^1715147981 is an apocalyptic number.

It is an amenable number.

1715147981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1715147981 is an equidigital number, since it uses as much as digits as its factorization.

1715147981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 44.

The square root of 1715147981 is about 41414.3451113259. The cubic root of 1715147981 is about 1197.0175894319.

The spelling of 1715147981 in words is "one billion, seven hundred fifteen million, one hundred forty-seven thousand, nine hundred eighty-one".