19956546131 has 2 divisors, whose sum is σ = 19956546132. Its totient is φ = 19956546130.

The previous prime is 19956546121. The next prime is 19956546149. The reversal of 19956546131 is 13164565991.

It is a weak prime.

It is an emirp because it is prime and its reverse (13164565991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19956546131 - 2¹⁸ = 19956283987 is a prime.

It is a super-2 number, since 2×19956546131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19956546131.

It is not a weakly prime, because it can be changed into another prime (19956546121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9978273065 + 9978273066.

It is an arithmetic number, because the mean of its divisors is an integer number (9978273066).

Almost surely, 2^19956546131 is an apocalyptic number.

19956546131 is a deficient number, since it is larger than the sum of its proper divisors (1).

19956546131 is an equidigital number, since it uses as much as digits as its factorization.

19956546131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 50.

The spelling of 19956546131 in words is "nineteen billion, nine hundred fifty-six million, five hundred forty-six thousand, one hundred thirty-one".