1209242645 has 8 divisors (see below), whose sum is σ = 1562713656. Its totient is φ = 892979136.

The previous prime is 1209242597. The next prime is 1209242653. The reversal of 1209242645 is 5462429021.

It can be written as a sum of positive squares in 4 ways, for example, as 287573764 + 921668881 = 16958^2 + 30359^2 .

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 1209242645 - 2¹⁴ = 1209226261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9301802 + ... + 9301931.

It is an arithmetic number, because the mean of its divisors is an integer number (195339207).

Almost surely, 2^1209242645 is an apocalyptic number.

It is an amenable number.

1209242645 is a deficient number, since it is larger than the sum of its proper divisors (353471011).

1209242645 is a wasteful number, since it uses less digits than its factorization.

1209242645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18603751.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1209242645 is about 34774.1663451477. The cubic root of 1209242645 is about 1065.3798655216.

The spelling of 1209242645 in words is "one billion, two hundred nine million, two hundred forty-two thousand, six hundred forty-five".