870669991 has 6 divisors (see below), whose sum is σ = 910171640. Its totient is φ = 832814268.

The previous prime is 870669983. The next prime is 870670039. The reversal of 870669991 is 199966078.

It is not a de Polignac number, because 870669991 - 2³ = 870669983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870669901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 822411 + ... + 823468.

Almost surely, 2^870669991 is an apocalyptic number.

870669991 is a deficient number, since it is larger than the sum of its proper divisors (39501649).

870669991 is a wasteful number, since it uses less digits than its factorization.

870669991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645925 (or 1645902 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 870669991 is about 29507.1176328695. The cubic root of 870669991 is about 954.8852656768.

The spelling of 870669991 in words is "eight hundred seventy million, six hundred sixty-nine thousand, nine hundred ninety-one".