13861398731 has 2 divisors, whose sum is σ = 13861398732. Its totient is φ = 13861398730.

The previous prime is 13861398721. The next prime is 13861398769. The reversal of 13861398731 is 13789316831.

It is a weak prime.

It is an emirp because it is prime and its reverse (13789316831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13861398731 - 2¹⁰ = 13861397707 is a prime.

It is a super-2 number, since 2×13861398731² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13861398731.

It is not a weakly prime, because it can be changed into another prime (13861398721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6930699365 + 6930699366.

It is an arithmetic number, because the mean of its divisors is an integer number (6930699366).

Almost surely, 2^13861398731 is an apocalyptic number.

13861398731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13861398731 is an equidigital number, since it uses as much as digits as its factorization.

13861398731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The spelling of 13861398731 in words is "thirteen billion, eight hundred sixty-one million, three hundred ninety-eight thousand, seven hundred thirty-one".