851530881 has 4 divisors (see below), whose sum is σ = 1135374512. Its totient is φ = 567687252.

The previous prime is 851530873. The next prime is 851530891. The reversal of 851530881 is 188035158.

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 not a de Polignac number, because 851530881 - 2³ = 851530873 is a prime.

It is a super-2 number, since 2×851530881² = 1450209682593272322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851530811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141921811 + ... + 141921816.

It is an arithmetic number, because the mean of its divisors is an integer number (283843628).

Almost surely, 2^851530881 is an apocalyptic number.

It is an amenable number.

851530881 is a deficient number, since it is larger than the sum of its proper divisors (283843631).

851530881 is a wasteful number, since it uses less digits than its factorization.

851530881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283843630.

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 851530881 is about 29181.0020561323. The cubic root of 851530881 is about 947.8365843319.

The spelling of 851530881 in words is "eight hundred fifty-one million, five hundred thirty thousand, eight hundred eighty-one".