1305491 has 4 divisors (see below), whose sum is σ = 1424184. Its totient is φ = 1186800.

The previous prime is 1305449. The next prime is 1305511. The reversal of 1305491 is 1945031.

It is a happy number.

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 1305491 - 2⁶ = 1305427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305401) 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 3 ways as a sum of consecutive naturals, for example, 59330 + ... + 59351.

It is an arithmetic number, because the mean of its divisors is an integer number (356046).

2^1305491 is an apocalyptic number.

1305491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1305491 is a deficient number, since it is larger than the sum of its proper divisors (118693).

1305491 is a wasteful number, since it uses less digits than its factorization.

1305491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118692.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1305491 is about 1142.5808505309. The cubic root of 1305491 is about 109.2927349845.

Adding to 1305491 its product of nonzero digits (540), we get a palindrome (1306031).

The spelling of 1305491 in words is "one million, three hundred five thousand, four hundred ninety-one".