1205491 has 4 divisors (see below), whose sum is σ = 1377712. Its totient is φ = 1033272.

The previous prime is 1205489. The next prime is 1205513. The reversal of 1205491 is 1945021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1205491 - 2¹ = 1205489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86100 + ... + 86113.

It is an arithmetic number, because the mean of its divisors is an integer number (344428).

2^1205491 is an apocalyptic number.

1205491 is a deficient number, since it is larger than the sum of its proper divisors (172221).

1205491 is an equidigital number, since it uses as much as digits as its factorization.

1205491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172220.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1205491 is about 1097.9485415993. The cubic root of 1205491 is about 106.4276952703.

The spelling of 1205491 in words is "one million, two hundred five thousand, four hundred ninety-one".