1373165345 has 4 divisors (see below), whose sum is σ = 1647798420. Its totient is φ = 1098532272.

The previous prime is 1373165309. The next prime is 1373165377. The reversal of 1373165345 is 5435613731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5435613731 = 28669 ⋅189599.

It can be written as a sum of positive squares in 2 ways, for example, as 228493456 + 1144671889 = 15116^2 + 33833^2 .

It is a cyclic number.

It is not a de Polignac number, because 1373165345 - 2¹⁰ = 1373164321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1373165299 and 1373165308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137316530 + ... + 137316539.

It is an arithmetic number, because the mean of its divisors is an integer number (411949605).

Almost surely, 2^1373165345 is an apocalyptic number.

It is an amenable number.

1373165345 is a deficient number, since it is larger than the sum of its proper divisors (274633075).

1373165345 is an equidigital number, since it uses as much as digits as its factorization.

1373165345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274633074.

The product of its digits is 113400, while the sum is 38.

The square root of 1373165345 is about 37056.2456948893. The cubic root of 1373165345 is about 1111.4952510683.

The spelling of 1373165345 in words is "one billion, three hundred seventy-three million, one hundred sixty-five thousand, three hundred forty-five".