870215561 has 8 divisors (see below), whose sum is σ = 924422400. Its totient is φ = 816849360.

The previous prime is 870215551. The next prime is 870215587. The reversal of 870215561 is 165512078.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 870215561 - 2¹⁰ = 870214537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870215551) 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 7 ways as a sum of consecutive naturals, for example, 208025 + ... + 212166.

It is an arithmetic number, because the mean of its divisors is an integer number (115552800).

Almost surely, 2^870215561 is an apocalyptic number.

It is an amenable number.

870215561 is a deficient number, since it is larger than the sum of its proper divisors (54206839).

870215561 is a wasteful number, since it uses less digits than its factorization.

870215561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420319.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 870215561 is about 29499.4162823606. The cubic root of 870215561 is about 954.7191085674.

The spelling of 870215561 in words is "eight hundred seventy million, two hundred fifteen thousand, five hundred sixty-one".