981577 has 2 divisors, whose sum is σ = 981578. Its totient is φ = 981576.

The previous prime is 981569. The next prime is 981587. The reversal of 981577 is 775189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 99856 = 939^2 + 316^2 .

It is an emirp because it is prime and its reverse (775189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981577 - 2³ = 981569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (981517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490788 + 490789.

It is an arithmetic number, because the mean of its divisors is an integer number (490789).

2⁹⁸¹⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

981577 is a deficient number, since it is larger than the sum of its proper divisors (1).

981577 is an equidigital number, since it uses as much as digits as its factorization.

981577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 981577 is about 990.7456787693. The cubic root of 981577 is about 99.3820897332.

The spelling of 981577 in words is "nine hundred eighty-one thousand, five hundred seventy-seven".