13887042731 has 4 divisors (see below), whose sum is σ = 13887973152. Its totient is φ = 13886112312.

The previous prime is 13887042713. The next prime is 13887042737. The reversal of 13887042731 is 13724078831.

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 13887042731 - 2⁶ = 13887042667 is a prime.

It is a super-2 number, since 2×13887042731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13887042737) 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, 442451 + ... + 472796.

It is an arithmetic number, because the mean of its divisors is an integer number (3471993288).

Almost surely, 2^13887042731 is an apocalyptic number.

13887042731 is a deficient number, since it is larger than the sum of its proper divisors (930421).

13887042731 is an equidigital number, since it uses as much as digits as its factorization.

13887042731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930420.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 13887042731 in words is "thirteen billion, eight hundred eighty-seven million, forty-two thousand, seven hundred thirty-one".