1309990145 has 8 divisors (see below), whose sum is σ = 1572291240. Its totient is φ = 1047790080.

The previous prime is 1309990133. The next prime is 1309990163. The reversal of 1309990145 is 5410999031.

It can be written as a sum of positive squares in 4 ways, for example, as 60155536 + 1249834609 = 7756^2 + 35353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1309990145 - 2¹⁸ = 1309728001 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7025 + ... + 51665.

It is an arithmetic number, because the mean of its divisors is an integer number (196536405).

Almost surely, 2^1309990145 is an apocalyptic number.

It is an amenable number.

1309990145 is a deficient number, since it is larger than the sum of its proper divisors (262301095).

1309990145 is an equidigital number, since it uses as much as digits as its factorization.

1309990145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50515.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 1309990145 is about 36193.7859998094. The cubic root of 1309990145 is about 1094.1814375436.

The spelling of 1309990145 in words is "one billion, three hundred nine million, nine hundred ninety thousand, one hundred forty-five".