1591265 has 8 divisors (see below), whose sum is σ = 2056488. Its totient is φ = 1175040.

The previous prime is 1591253. The next prime is 1591267. The reversal of 1591265 is 5621951.

It can be written as a sum of positive squares in 4 ways, for example, as 73441 + 1517824 = 271^2 + 1232^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1591265 - 2¹⁰ = 1590241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1591267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12176 + ... + 12305.

It is an arithmetic number, because the mean of its divisors is an integer number (257061).

2^1591265 is an apocalyptic number.

It is an amenable number.

1591265 is a deficient number, since it is larger than the sum of its proper divisors (465223).

1591265 is a wasteful number, since it uses less digits than its factorization.

1591265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24499.

The product of its digits is 2700, while the sum is 29.

The square root of 1591265 is about 1261.4535266905. The cubic root of 1591265 is about 116.7474768930.

The spelling of 1591265 in words is "one million, five hundred ninety-one thousand, two hundred sixty-five".