1245109 has 4 divisors (see below), whose sum is σ = 1247616. Its totient is φ = 1242604.

The previous prime is 1245103. The next prime is 1245113. The reversal of 1245109 is 9015421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1245109 - 2¹⁷ = 1114037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229 + ... + 1594.

It is an arithmetic number, because the mean of its divisors is an integer number (311904).

2^1245109 is an apocalyptic number.

It is an amenable number.

1245109 is a deficient number, since it is larger than the sum of its proper divisors (2507).

1245109 is an equidigital number, since it uses as much as digits as its factorization.

1245109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506.

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

The square root of 1245109 is about 1115.8445232200. The cubic root of 1245109 is about 107.5810529879.

The spelling of 1245109 in words is "one million, two hundred forty-five thousand, one hundred nine".