1300138549 has 4 divisors (see below), whose sum is σ = 1356666336. Its totient is φ = 1243610764.

The previous prime is 1300138547. The next prime is 1300138561. The reversal of 1300138549 is 9458310031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9458310031 = 24877 ⋅380203.

It is a cyclic number.

It is not a de Polignac number, because 1300138549 - 2¹ = 1300138547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300138547) 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, 28263859 + ... + 28263904.

It is an arithmetic number, because the mean of its divisors is an integer number (339166584).

Almost surely, 2^1300138549 is an apocalyptic number.

It is an amenable number.

1300138549 is a deficient number, since it is larger than the sum of its proper divisors (56527787).

1300138549 is an equidigital number, since it uses as much as digits as its factorization.

1300138549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56527786.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1300138549 is about 36057.4340323878. The cubic root of 1300138549 is about 1091.4316538357.

The spelling of 1300138549 in words is "one billion, three hundred million, one hundred thirty-eight thousand, five hundred forty-nine".