72019789381 has 2 divisors, whose sum is σ = 72019789382. Its totient is φ = 72019789380.

The previous prime is 72019789357. The next prime is 72019789463. The reversal of 72019789381 is 18398791027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67699356481 + 4320432900 = 260191^2 + 65730^2 .

It is an emirp because it is prime and its reverse (18398791027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72019789381 - 2¹⁷ = 72019658309 is a prime.

It is a super-2 number, since 2×72019789381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72019787381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36009894690 + 36009894691.

It is an arithmetic number, because the mean of its divisors is an integer number (36009894691).

Almost surely, 2^72019789381 is an apocalyptic number.

It is an amenable number.

72019789381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72019789381 is an equidigital number, since it uses as much as digits as its factorization.

72019789381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 72019789381 in words is "seventy-two billion, nineteen million, seven hundred eighty-nine thousand, three hundred eighty-one".