862805981 has 12 divisors (see below), whose sum is σ = 943997436. Its totient is φ = 785842560.

The previous prime is 862805939. The next prime is 862806011. The reversal of 862805981 is 189508268.

It can be written as a sum of positive squares in 2 ways, for example, as 230736100 + 632069881 = 15190^2 + 25141^2 .

It is not a de Polignac number, because 862805981 - 2⁶ = 862805917 is a prime.

It is a super-2 number, since 2×862805981² = 1488868321698744722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (862805381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10070 + ... + 42743.

It is an arithmetic number, because the mean of its divisors is an integer number (78666453).

Almost surely, 2^862805981 is an apocalyptic number.

It is an amenable number.

862805981 is a deficient number, since it is larger than the sum of its proper divisors (81191455).

862805981 is a wasteful number, since it uses less digits than its factorization.

862805981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52892 (or 52861 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 862805981 is about 29373.5592157301. The cubic root of 862805981 is about 952.0016819198.

The spelling of 862805981 in words is "eight hundred sixty-two million, eight hundred five thousand, nine hundred eighty-one".