1370891605 has 4 divisors (see below), whose sum is σ = 1645069932. Its totient is φ = 1096713280.

The previous prime is 1370891573. The next prime is 1370891633. The reversal of 1370891605 is 5061980731.

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 543869041 + 827022564 = 23321^2 + 28758^2 .

It is not a de Polignac number, because 1370891605 - 2⁵ = 1370891573 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 137089156 + ... + 137089165.

It is an arithmetic number, because the mean of its divisors is an integer number (411267483).

Almost surely, 2^1370891605 is an apocalyptic number.

It is an amenable number.

1370891605 is a deficient number, since it is larger than the sum of its proper divisors (274178327).

1370891605 is an equidigital number, since it uses as much as digits as its factorization.

1370891605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274178326.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 1370891605 is about 37025.5534057224. The cubic root of 1370891605 is about 1110.8814266145.

The spelling of 1370891605 in words is "one billion, three hundred seventy million, eight hundred ninety-one thousand, six hundred five".