870989969 has 4 divisors (see below), whose sum is σ = 887423796. Its totient is φ = 854556144.

The previous prime is 870989957. The next prime is 870989971. The reversal of 870989969 is 969989078.

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 462465025 + 408524944 = 21505^2 + 20212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-870989969 is a prime.

It is a super-2 number, since 2×870989969² = 1517247052197241922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870989069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8216834 + ... + 8216939.

It is an arithmetic number, because the mean of its divisors is an integer number (221855949).

Almost surely, 2^870989969 is an apocalyptic number.

It is an amenable number.

870989969 is a deficient number, since it is larger than the sum of its proper divisors (16433827).

870989969 is a wasteful number, since it uses less digits than its factorization.

870989969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16433826.

The product of its (nonzero) digits is 17635968, while the sum is 65.

The square root of 870989969 is about 29512.5391825238. The cubic root of 870989969 is about 955.0022272729.

The spelling of 870989969 in words is "eight hundred seventy million, nine hundred eighty-nine thousand, nine hundred sixty-nine".