1209090313 has 4 divisors (see below), whose sum is σ = 1225653268. Its totient is φ = 1192527360.

The previous prime is 1209090293. The next prime is 1209090367. The reversal of 1209090313 is 3130909021.

1209090313 = 24587² + 24588².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3130909021 = 3917 ⋅799313.

It can be written as a sum of positive squares in 2 ways, for example, as 604569744 + 604520569 = 24588^2 + 24587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209090313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209090373) 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, 8281368 + ... + 8281513.

It is an arithmetic number, because the mean of its divisors is an integer number (306413317).

Almost surely, 2^1209090313 is an apocalyptic number.

1209090313 is the 24588-th centered square number.

It is an amenable number.

1209090313 is a deficient number, since it is larger than the sum of its proper divisors (16562955).

1209090313 is an equidigital number, since it uses as much as digits as its factorization.

1209090313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16562954.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 1209090313 is about 34771.9759720382. The cubic root of 1209090313 is about 1065.3351272546.

Adding to 1209090313 its reverse (3130909021), we get a palindrome (4339999334).

The spelling of 1209090313 in words is "one billion, two hundred nine million, ninety thousand, three hundred thirteen".