850020981 has 4 divisors (see below), whose sum is σ = 1133361312. Its totient is φ = 566680652.

The previous prime is 850020971. The next prime is 850020989. The reversal of 850020981 is 189020058.

It is a happy number.

850020981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 850020981 - 2¹³ = 850012789 is a prime.

It is a super-2 number, since 2×850020981² = 1445071336280404722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850020989) 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, 141670161 + ... + 141670166.

It is an arithmetic number, because the mean of its divisors is an integer number (283340328).

Almost surely, 2^850020981 is an apocalyptic number.

It is an amenable number.

850020981 is a deficient number, since it is larger than the sum of its proper divisors (283340331).

850020981 is a wasteful number, since it uses less digits than its factorization.

850020981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283340330.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 850020981 is about 29155.1192931876. The cubic root of 850020981 is about 947.2760310962.

The spelling of 850020981 in words is "eight hundred fifty million, twenty thousand, nine hundred eighty-one".