1213523450009 has 4 divisors (see below), whose sum is σ = 1306871407716. Its totient is φ = 1120175492304.

The previous prime is 1213523449993. The next prime is 1213523450021. The reversal of 1213523450009 is 9000543253121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 646472281225 + 567051168784 = 804035^2 + 753028^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213523450009 - 2⁴ = 1213523449993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213523450509) 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, 46673978834 + ... + 46673978859.

It is an arithmetic number, because the mean of its divisors is an integer number (326717851929).

Almost surely, 2^{1213523450009} is an apocalyptic number.

It is an amenable number.

1213523450009 is a deficient number, since it is larger than the sum of its proper divisors (93347957707).

1213523450009 is an equidigital number, since it uses as much as digits as its factorization.

1213523450009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93347957706.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 1213523450009 in words is "one trillion, two hundred thirteen billion, five hundred twenty-three million, four hundred fifty thousand, nine".