853980781 has 4 divisors (see below), whose sum is σ = 854170912. Its totient is φ = 853790652.

The previous prime is 853980773. The next prime is 853980793. The reversal of 853980781 is 187089358.

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 853980781 - 2³ = 853980773 is a prime.

It is a super-2 number, since 2×853980781² = 1458566348634739922, 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 (853980481) 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, 88161 + ... + 97366.

It is an arithmetic number, because the mean of its divisors is an integer number (213542728).

Almost surely, 2^853980781 is an apocalyptic number.

It is an amenable number.

853980781 is a deficient number, since it is larger than the sum of its proper divisors (190131).

853980781 is a wasteful number, since it uses less digits than its factorization.

853980781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190130.

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 853980781 is about 29222.9495602343. The cubic root of 853980781 is about 948.7447062068.

The spelling of 853980781 in words is "eight hundred fifty-three million, nine hundred eighty thousand, seven hundred eighty-one".