1213512622789 has 4 divisors (see below), whose sum is σ = 1213514901100. Its totient is φ = 1213510344480.

The previous prime is 1213512622759. The next prime is 1213512622799. The reversal of 1213512622789 is 9872262153121.

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 17479484100 + 1196033138689 = 132210^2 + 1093633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213512622789 - 2⁷ = 1213512622661 is a prime.

It is a super-2 number, since 2×1213512622789² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213512622759) 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, 134419 + ... + 1563679.

It is an arithmetic number, because the mean of its divisors is an integer number (303378725275).

Almost surely, 2^{1213512622789} is an apocalyptic number.

It is an amenable number.

1213512622789 is a deficient number, since it is larger than the sum of its proper divisors (2278311).

1213512622789 is an equidigital number, since it uses as much as digits as its factorization.

1213512622789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278310.

The product of its digits is 725760, while the sum is 49.

The spelling of 1213512622789 in words is "one trillion, two hundred thirteen billion, five hundred twelve million, six hundred twenty-two thousand, seven hundred eighty-nine".