1319749045 has 4 divisors (see below), whose sum is σ = 1583698860. Its totient is φ = 1055799232.

The previous prime is 1319749043. The next prime is 1319749051. The reversal of 1319749045 is 5409479131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5409479131 = 7 ⋅772782733.

It can be written as a sum of positive squares in 2 ways, for example, as 886193361 + 433555684 = 29769^2 + 20822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1319749045 - 2¹ = 1319749043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1319748992 and 1319749010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319749043) 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, 131974900 + ... + 131974909.

It is an arithmetic number, because the mean of its divisors is an integer number (395924715).

Almost surely, 2^1319749045 is an apocalyptic number.

It is an amenable number.

1319749045 is a deficient number, since it is larger than the sum of its proper divisors (263949815).

1319749045 is an equidigital number, since it uses as much as digits as its factorization.

1319749045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263949814.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1319749045 is about 36328.3504304834. The cubic root of 1319749045 is about 1096.8917889276.

The spelling of 1319749045 in words is "one billion, three hundred nineteen million, seven hundred forty-nine thousand, forty-five".