1300020391 has 4 divisors (see below), whose sum is σ = 1301589400. Its totient is φ = 1298451384.

The previous prime is 1300020377. The next prime is 1300020431. The reversal of 1300020391 is 1930200031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1300020391 - 2¹³ = 1300012199 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 (1300020301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783261 + ... + 784918.

It is an arithmetic number, because the mean of its divisors is an integer number (325397350).

Almost surely, 2^1300020391 is an apocalyptic number.

1300020391 is a deficient number, since it is larger than the sum of its proper divisors (1569009).

1300020391 is an equidigital number, since it uses as much as digits as its factorization.

1300020391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569008.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1300020391 is about 36055.7955258236. The cubic root of 1300020391 is about 1091.3985893370.

The spelling of 1300020391 in words is "one billion, three hundred million, twenty thousand, three hundred ninety-one".