870729091 has 4 divisors (see below), whose sum is σ = 874040112. Its totient is φ = 867418072.

The previous prime is 870729061. The next prime is 870729121. The reversal of 870729091 is 190927078.

It is a happy number.

870729091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (870729061) and next prime (870729121).

It is a cyclic number.

It is not a de Polignac number, because 870729091 - 2²³ = 862340483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870729061) 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, 1655116 + ... + 1655641.

It is an arithmetic number, because the mean of its divisors is an integer number (218510028).

Almost surely, 2^870729091 is an apocalyptic number.

870729091 is a deficient number, since it is larger than the sum of its proper divisors (3311021).

870729091 is a wasteful number, since it uses less digits than its factorization.

870729091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311020.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 870729091 is about 29508.1190691647. The cubic root of 870729091 is about 954.9068706642.

The spelling of 870729091 in words is "eight hundred seventy million, seven hundred twenty-nine thousand, ninety-one".