13875946409 has 4 divisors (see below), whose sum is σ = 14943326916. Its totient is φ = 12808565904.

The previous prime is 13875946379. The next prime is 13875946439. The reversal of 13875946409 is 90464957831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90464957831 = 151 ⋅599105681.

It is an interprime number because it is at equal distance from previous prime (13875946379) and next prime (13875946439).

It can be written as a sum of positive squares in 2 ways, for example, as 9178214809 + 4697731600 = 95803^2 + 68540^2 .

It is a cyclic number.

It is not a de Polignac number, because 13875946409 - 2⁸ = 13875946153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13875946439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533690234 + ... + 533690259.

It is an arithmetic number, because the mean of its divisors is an integer number (3735831729).

Almost surely, 2^13875946409 is an apocalyptic number.

It is an amenable number.

13875946409 is a deficient number, since it is larger than the sum of its proper divisors (1067380507).

13875946409 is a wasteful number, since it uses less digits than its factorization.

13875946409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067380506.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 13875946409 in words is "thirteen billion, eight hundred seventy-five million, nine hundred forty-six thousand, four hundred nine".