19989131 has 2 divisors, whose sum is σ = 19989132. Its totient is φ = 19989130.

The previous prime is 19989113. The next prime is 19989157. The reversal of 19989131 is 13198991.

It is a happy number.

Together with previous prime (19989113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19989131 - 2¹⁴ = 19972747 is a prime.

It is a super-2 number, since 2×19989131² = 799130716270322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19989191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994565 + 9994566.

It is an arithmetic number, because the mean of its divisors is an integer number (9994566).

Almost surely, 2^19989131 is an apocalyptic number.

19989131 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989131 is an equidigital number, since it uses as much as digits as its factorization.

19989131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 41.

The square root of 19989131 is about 4470.9205987134. The cubic root of 19989131 is about 271.3925810742.

The spelling of 19989131 in words is "nineteen million, nine hundred eighty-nine thousand, one hundred thirty-one".