830981 has 2 divisors, whose sum is σ = 830982. Its totient is φ = 830980.

The previous prime is 830957. The next prime is 830989. The reversal of 830981 is 189038.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429025 + 401956 = 655^2 + 634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-830981 is a prime.

It is a super-2 number, since 2×830981² = 1381058844722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (830989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415490 + 415491.

It is an arithmetic number, because the mean of its divisors is an integer number (415491).

2⁸³⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

830981 is a deficient number, since it is larger than the sum of its proper divisors (1).

830981 is an equidigital number, since it uses as much as digits as its factorization.

830981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 830981 is about 911.5815926180. The cubic root of 830981 is about 94.0149742253.

The spelling of 830981 in words is "eight hundred thirty thousand, nine hundred eighty-one".