853981 has 2 divisors, whose sum is σ = 853982. Its totient is φ = 853980.

The previous prime is 853969. The next prime is 853999. The reversal of 853981 is 189358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783225 + 70756 = 885^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 853981 - 2⁵ = 853949 is a prime.

It is a super-2 number, since 2×853981² = 1458567096722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (853901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426990 + 426991.

It is an arithmetic number, because the mean of its divisors is an integer number (426991).

2⁸⁵³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

853981 is a deficient number, since it is larger than the sum of its proper divisors (1).

853981 is an equidigital number, since it uses as much as digits as its factorization.

853981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 853981 is about 924.1109240778. The cubic root of 853981 is about 94.8744787307.

The spelling of 853981 in words is "eight hundred fifty-three thousand, nine hundred eighty-one".