870941509 has 4 divisors (see below), whose sum is σ = 883940704. Its totient is φ = 857942316.

The previous prime is 870941471. The next prime is 870941521. The reversal of 870941509 is 905149078.

870941509 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, 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 870941509 - 2¹³ = 870933317 is a prime.

It is a super-2 number, since 2×870941509² = 1517078224198394162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870941549) 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, 6499497 + ... + 6499630.

It is an arithmetic number, because the mean of its divisors is an integer number (220985176).

Almost surely, 2^870941509 is an apocalyptic number.

It is an amenable number.

870941509 is a deficient number, since it is larger than the sum of its proper divisors (12999195).

870941509 is a wasteful number, since it uses less digits than its factorization.

870941509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12999194.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 870941509 is about 29511.7181641463. The cubic root of 870941509 is about 954.9845155243.

The spelling of 870941509 in words is "eight hundred seventy million, nine hundred forty-one thousand, five hundred nine".