870111681 has 4 divisors (see below), whose sum is σ = 1160148912. Its totient is φ = 580074452.

The previous prime is 870111677. The next prime is 870111719. The reversal of 870111681 is 186111078.

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 870111681 - 2² = 870111677 is a prime.

It is a super-2 number, since 2×870111681² = 1514188674825291522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (870111181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145018611 + ... + 145018616.

It is an arithmetic number, because the mean of its divisors is an integer number (290037228).

Almost surely, 2^870111681 is an apocalyptic number.

It is an amenable number.

870111681 is a deficient number, since it is larger than the sum of its proper divisors (290037231).

870111681 is a wasteful number, since it uses less digits than its factorization.

870111681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290037230.

The product of its (nonzero) digits is 2688, while the sum is 33.

The square root of 870111681 is about 29497.6555170068. The cubic root of 870111681 is about 954.6811179162.

The spelling of 870111681 in words is "eight hundred seventy million, one hundred eleven thousand, six hundred eighty-one".