1309425811 has 4 divisors (see below), whose sum is σ = 1366357392. Its totient is φ = 1252494232.

The previous prime is 1309425787. The next prime is 1309425883. The reversal of 1309425811 is 1185249031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1185249031 = 2273 ⋅521447.

It is a cyclic number.

It is not a de Polignac number, because 1309425811 - 2⁷ = 1309425683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309425011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28465756 + ... + 28465801.

It is an arithmetic number, because the mean of its divisors is an integer number (341589348).

Almost surely, 2^1309425811 is an apocalyptic number.

1309425811 is a deficient number, since it is larger than the sum of its proper divisors (56931581).

1309425811 is an equidigital number, since it uses as much as digits as its factorization.

1309425811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56931580.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1309425811 is about 36185.9891532621. The cubic root of 1309425811 is about 1094.0242932374.

The spelling of 1309425811 in words is "one billion, three hundred nine million, four hundred twenty-five thousand, eight hundred eleven".