859261981 has 4 divisors (see below), whose sum is σ = 868916700. Its totient is φ = 849607264.

The previous prime is 859261979. The next prime is 859262003. The reversal of 859261981 is 189162958.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375041956 + 484220025 = 19366^2 + 22005^2 .

It is a cyclic number.

It is not a de Polignac number, because 859261981 - 2¹ = 859261979 is a prime.

It is a super-2 number, since 2×859261981² = 1476662303984088722, 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 (859261961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4827226 + ... + 4827403.

It is an arithmetic number, because the mean of its divisors is an integer number (217229175).

Almost surely, 2^859261981 is an apocalyptic number.

It is an amenable number.

859261981 is a deficient number, since it is larger than the sum of its proper divisors (9654719).

859261981 is an equidigital number, since it uses as much as digits as its factorization.

859261981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9654718.

The product of its digits is 311040, while the sum is 49.

The square root of 859261981 is about 29313.1707769733. The cubic root of 859261981 is about 950.6964352168.

The spelling of 859261981 in words is "eight hundred fifty-nine million, two hundred sixty-one thousand, nine hundred eighty-one".