850403981 has 4 divisors (see below), whose sum is σ = 971890272. Its totient is φ = 728917692.

The previous prime is 850403977. The next prime is 850404011. The reversal of 850403981 is 189304058.

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 850403981 - 2² = 850403977 is a prime.

It is a super-2 number, since 2×850403981² = 1446373861801296722, 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 (850406981) 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, 60743135 + ... + 60743148.

It is an arithmetic number, because the mean of its divisors is an integer number (242972568).

Almost surely, 2^850403981 is an apocalyptic number.

It is an amenable number.

850403981 is a deficient number, since it is larger than the sum of its proper divisors (121486291).

850403981 is a wasteful number, since it uses less digits than its factorization.

850403981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121486290.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 850403981 is about 29161.6868682180. The cubic root of 850403981 is about 947.4182833664.

The spelling of 850403981 in words is "eight hundred fifty million, four hundred three thousand, nine hundred eighty-one".