981913 has 2 divisors, whose sum is σ = 981914. Its totient is φ = 981912.

The previous prime is 981889. The next prime is 981919. The reversal of 981913 is 319189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974169 + 7744 = 987^2 + 88^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981913 is a prime.

It is not a weakly prime, because it can be changed into another prime (981919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490956 + 490957.

It is an arithmetic number, because the mean of its divisors is an integer number (490957).

2⁹⁸¹⁹¹³ is an apocalyptic number.

It is an amenable number.

981913 is a deficient number, since it is larger than the sum of its proper divisors (1).

981913 is an equidigital number, since it uses as much as digits as its factorization.

981913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 981913 is about 990.9152335089. The cubic root of 981913 is about 99.3934281450.

The spelling of 981913 in words is "nine hundred eighty-one thousand, nine hundred thirteen".