1290591 has 12 divisors (see below), whose sum is σ = 1876368. Its totient is φ = 854784.

The previous prime is 1290581. The next prime is 1290593. The reversal of 1290591 is 1950921.

It is a happy number.

It is not a de Polignac number, because 1290591 - 2⁷ = 1290463 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290593) 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 11 ways as a sum of consecutive naturals, for example, 1366 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (156364).

2^1290591 is an apocalyptic number.

1290591 is a deficient number, since it is larger than the sum of its proper divisors (585777).

1290591 is a wasteful number, since it uses less digits than its factorization.

1290591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 1290591 is about 1136.0418126108. The cubic root of 1290591 is about 108.8753449688.

It can be divided in two parts, 12905 and 91, that added together give a square (12996 = 114²).

The spelling of 1290591 in words is "one million, two hundred ninety thousand, five hundred ninety-one".