1089261 has 8 divisors (see below), whose sum is σ = 1613760. Its totient is φ = 726156.

The previous prime is 1089259. The next prime is 1089299. The reversal of 1089261 is 1629801.

It is not a de Polignac number, because 1089261 - 2¹ = 1089259 is a prime.

It is a super-2 number, since 2×1089261² = 2372979052242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 40343 = 1089261 / (1 + 0 + 8 + 9 + 2 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089161) 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, 20145 + ... + 20198.

It is an arithmetic number, because the mean of its divisors is an integer number (201720).

2^1089261 is an apocalyptic number.

It is an amenable number.

1089261 is a deficient number, since it is larger than the sum of its proper divisors (524499).

1089261 is an equidigital number, since it uses as much as digits as its factorization.

1089261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40352 (or 40346 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1089261 is about 1043.6766740710. The cubic root of 1089261 is about 102.8909834087.

The spelling of 1089261 in words is "one million, eighty-nine thousand, two hundred sixty-one".