18936969131 has 2 divisors, whose sum is σ = 18936969132. Its totient is φ = 18936969130.

The previous prime is 18936969127. The next prime is 18936969167. The reversal of 18936969131 is 13196963981.

It is a weak prime.

It is an emirp because it is prime and its reverse (13196963981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18936969131 - 2² = 18936969127 is a prime.

It is a super-2 number, since 2×18936969131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18936969031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468484565 + 9468484566.

It is an arithmetic number, because the mean of its divisors is an integer number (9468484566).

Almost surely, 2^18936969131 is an apocalyptic number.

18936969131 is a deficient number, since it is larger than the sum of its proper divisors (1).

18936969131 is an equidigital number, since it uses as much as digits as its factorization.

18936969131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 56.

The spelling of 18936969131 in words is "eighteen billion, nine hundred thirty-six million, nine hundred sixty-nine thousand, one hundred thirty-one".