870623221 has 8 divisors (see below), whose sum is σ = 946197560. Its totient is φ = 796277952.

The previous prime is 870623207. The next prime is 870623231. The reversal of 870623221 is 122326078.

It can be written as a sum of positive squares in 4 ways, for example, as 1199025 + 869424196 = 1095^2 + 29486^2 .

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 870623221 - 2⁷ = 870623093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870623231) 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, 305790 + ... + 308623.

It is an arithmetic number, because the mean of its divisors is an integer number (118274695).

Almost surely, 2^870623221 is an apocalyptic number.

It is an amenable number.

870623221 is a deficient number, since it is larger than the sum of its proper divisors (75574339).

870623221 is a wasteful number, since it uses less digits than its factorization.

870623221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614535.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 870623221 is about 29506.3251015778. The cubic root of 870623221 is about 954.8681674329.

Adding to 870623221 its reverse (122326078), we get a palindrome (992949299).

The spelling of 870623221 in words is "eight hundred seventy million, six hundred twenty-three thousand, two hundred twenty-one".