1213757031173 has 4 divisors (see below), whose sum is σ = 1213761513420. Its totient is φ = 1213752548928.

The previous prime is 1213757031169. The next prime is 1213757031181. The reversal of 1213757031173 is 3711307573121.

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 18718891489 + 1195038139684 = 136817^2 + 1093178^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213757031173 - 2² = 1213757031169 is a prime.

It is a super-2 number, since 2×1213757031173² (a number of 25 digits) contains 22 as substring.

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 1213757031173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213757031103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806890 + ... + 2385867.

It is an arithmetic number, because the mean of its divisors is an integer number (303440378355).

Almost surely, 2^{1213757031173} is an apocalyptic number.

It is an amenable number.

1213757031173 is a deficient number, since it is larger than the sum of its proper divisors (4482247).

1213757031173 is an equidigital number, since it uses as much as digits as its factorization.

1213757031173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482246.

The product of its (nonzero) digits is 92610, while the sum is 41.

The spelling of 1213757031173 in words is "one trillion, two hundred thirteen billion, seven hundred fifty-seven million, thirty-one thousand, one hundred seventy-three".