800173981 has 4 divisors (see below), whose sum is σ = 801231772. Its totient is φ = 799116192.

The previous prime is 800173967. The next prime is 800173993. The reversal of 800173981 is 189371008.

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 690112900 + 110061081 = 26270^2 + 10491^2 .

It is a cyclic number.

It is not a de Polignac number, because 800173981 - 2⁵ = 800173949 is a prime.

It is a super-2 number, since 2×800173981² = 1280556799738776722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 800173981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800173931) 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, 527760 + ... + 529273.

It is an arithmetic number, because the mean of its divisors is an integer number (200307943).

Almost surely, 2^800173981 is an apocalyptic number.

It is an amenable number.

800173981 is a deficient number, since it is larger than the sum of its proper divisors (1057791).

800173981 is a wasteful number, since it uses less digits than its factorization.

800173981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057790.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 800173981 is about 28287.3466588862. The cubic root of 800173981 is about 928.3850575336.

The spelling of 800173981 in words is "eight hundred million, one hundred seventy-three thousand, nine hundred eighty-one".