19713131 has 2 divisors, whose sum is σ = 19713132. Its totient is φ = 19713130.

The previous prime is 19713121. The next prime is 19713137. The reversal of 19713131 is 13131791.

It is a strong prime.

It is an emirp because it is prime and its reverse (13131791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19713131 - 2¹⁰ = 19712107 is a prime.

It is a super-2 number, since 2×19713131² = 777215067646322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19713131.

It is not a weakly prime, because it can be changed into another prime (19713137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856565 + 9856566.

It is an arithmetic number, because the mean of its divisors is an integer number (9856566).

Almost surely, 2^19713131 is an apocalyptic number.

19713131 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713131 is an equidigital number, since it uses as much as digits as its factorization.

19713131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 567, while the sum is 26.

The square root of 19713131 is about 4439.9471843706. The cubic root of 19713131 is about 270.1377029633.

The spelling of 19713131 in words is "nineteen million, seven hundred thirteen thousand, one hundred thirty-one".