16870591 has 4 divisors (see below), whose sum is σ = 16993872. Its totient is φ = 16747312.

The previous prime is 16870559. The next prime is 16870621. The reversal of 16870591 is 19507861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16870591 - 2⁵ = 16870559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16870591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16877591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61435 + ... + 61708.

It is an arithmetic number, because the mean of its divisors is an integer number (4248468).

Almost surely, 2^16870591 is an apocalyptic number.

16870591 is a deficient number, since it is larger than the sum of its proper divisors (123281).

16870591 is a wasteful number, since it uses less digits than its factorization.

16870591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123280.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 16870591 is about 4107.3824998410. The cubic root of 16870591 is about 256.4740514366.

The spelling of 16870591 in words is "sixteen million, eight hundred seventy thousand, five hundred ninety-one".