999870361 has 4 divisors (see below), whose sum is σ = 1142708992. Its totient is φ = 857031732.

The previous prime is 999870359. The next prime is 999870367. The reversal of 999870361 is 163078999.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163078999 = 1367 ⋅119297.

It is a cyclic number.

It is not a de Polignac number, because 999870361 - 2¹ = 999870359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999870299 and 999870308.

It is not an unprimeable number, because it can be changed into a prime (999870367) 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, 71419305 + ... + 71419318.

It is an arithmetic number, because the mean of its divisors is an integer number (285677248).

Almost surely, 2^999870361 is an apocalyptic number.

It is an amenable number.

999870361 is a deficient number, since it is larger than the sum of its proper divisors (142838631).

999870361 is a wasteful number, since it uses less digits than its factorization.

999870361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142838630.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 999870361 is about 31620.7267626789. The cubic root of 999870361 is about 999.9567851325.

The spelling of 999870361 in words is "nine hundred ninety-nine million, eight hundred seventy thousand, three hundred sixty-one".