1591121 has 4 divisors (see below), whose sum is σ = 1818432. Its totient is φ = 1363812.

The previous prime is 1591103. The next prime is 1591127. The reversal of 1591121 is 1211951.

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 cyclic number.

It is not a de Polignac number, because 1591121 - 2¹⁴ = 1574737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1591093 and 1591102.

It is not an unprimeable number, because it can be changed into a prime (1591127) 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, 113645 + ... + 113658.

It is an arithmetic number, because the mean of its divisors is an integer number (454608).

2^1591121 is an apocalyptic number.

It is an amenable number.

1591121 is a deficient number, since it is larger than the sum of its proper divisors (227311).

1591121 is an equidigital number, since it uses as much as digits as its factorization.

1591121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227310.

The product of its digits is 90, while the sum is 20.

The square root of 1591121 is about 1261.3964483857. The cubic root of 1591121 is about 116.7439551364.

The spelling of 1591121 in words is "one million, five hundred ninety-one thousand, one hundred twenty-one".