870642101 has 4 divisors (see below), whose sum is σ = 995019552. Its totient is φ = 746264652.

The previous prime is 870641983. The next prime is 870642103. The reversal of 870642101 is 101246078.

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 de Polignac number, because none of the positive numbers 2^k-870642101 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 (870642103) 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, 62188715 + ... + 62188728.

It is an arithmetic number, because the mean of its divisors is an integer number (248754888).

Almost surely, 2^870642101 is an apocalyptic number.

It is an amenable number.

870642101 is a deficient number, since it is larger than the sum of its proper divisors (124377451).

870642101 is a wasteful number, since it uses less digits than its factorization.

870642101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124377450.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 870642101 is about 29506.6450312468. The cubic root of 870642101 is about 954.8750696842.

Adding to 870642101 its reverse (101246078), we get a palindrome (971888179).

The spelling of 870642101 in words is "eight hundred seventy million, six hundred forty-two thousand, one hundred one".