19739212381 has 6 divisors (see below), whose sum is σ = 22961940990. Its totient is φ = 16919324856.

The previous prime is 19739212351. The next prime is 19739212403. The reversal of 19739212381 is 18321293791.

It can be written as a sum of positive squares in only one way, i.e., 16882844356 + 2856368025 = 129934^2 + 53445^2 .

It is not a de Polignac number, because 19739212381 - 2⁵ = 19739212349 is a prime.

It is a super-2 number, since 2×19739212381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19739212301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201420486 + ... + 201420583.

It is an arithmetic number, because the mean of its divisors is an integer number (3826990165).

Almost surely, 2^19739212381 is an apocalyptic number.

It is an amenable number.

19739212381 is a deficient number, since it is larger than the sum of its proper divisors (3222728609).

19739212381 is an equidigital number, since it uses as much as digits as its factorization.

19739212381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402841083 (or 402841076 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The spelling of 19739212381 in words is "nineteen billion, seven hundred thirty-nine million, two hundred twelve thousand, three hundred eighty-one".