1891559 has 4 divisors (see below), whose sum is σ = 1905504. Its totient is φ = 1877616.

The previous prime is 1891541. The next prime is 1891567. The reversal of 1891559 is 9551981.

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 1891559 - 2⁸ = 1891303 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 (1891529) 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, 6767 + ... + 7040.

It is an arithmetic number, because the mean of its divisors is an integer number (476376).

2^1891559 is an apocalyptic number.

1891559 is a deficient number, since it is larger than the sum of its proper divisors (13945).

1891559 is a wasteful number, since it uses less digits than its factorization.

1891559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13944.

The product of its digits is 16200, while the sum is 38.

The square root of 1891559 is about 1375.3395944275. The cubic root of 1891559 is about 123.6725448037.

The spelling of 1891559 in words is "one million, eight hundred ninety-one thousand, five hundred fifty-nine".