981517 has 2 divisors, whose sum is σ = 981518. Its totient is φ = 981516.

The previous prime is 981493. The next prime is 981523. The reversal of 981517 is 715189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826281 + 155236 = 909^2 + 394^2 .

It is an emirp because it is prime and its reverse (715189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981517 - 2¹⁵ = 948749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490758 + 490759.

It is an arithmetic number, because the mean of its divisors is an integer number (490759).

2⁹⁸¹⁵¹⁷ is an apocalyptic number.

It is an amenable number.

981517 is a deficient number, since it is larger than the sum of its proper divisors (1).

981517 is an equidigital number, since it uses as much as digits as its factorization.

981517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 31.

The square root of 981517 is about 990.7153980836. The cubic root of 981517 is about 99.3800647446.

The spelling of 981517 in words is "nine hundred eighty-one thousand, five hundred seventeen".