1285591 has 8 divisors (see below), whose sum is σ = 1391040. Its totient is φ = 1183488.

The previous prime is 1285553. The next prime is 1285607. The reversal of 1285591 is 1955821.

1285591 = T₂₁₀ + T₂₁₁ + ... + T₂₅₆.

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

It is a cyclic number.

It is not a de Polignac number, because 1285591 - 2¹¹ = 1283543 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 (1285511) 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, 6 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2^1285591 is an apocalyptic number.

1285591 is a deficient number, since it is larger than the sum of its proper divisors (105449).

1285591 is a wasteful number, since it uses less digits than its factorization.

1285591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673.

The product of its digits is 3600, while the sum is 31.

The square root of 1285591 is about 1133.8390538344. The cubic root of 1285591 is about 108.7345615993.

The spelling of 1285591 in words is "one million, two hundred eighty-five thousand, five hundred ninety-one".