139783381 has 2 divisors, whose sum is σ = 139783382. Its totient is φ = 139783380.

The previous prime is 139783379. The next prime is 139783417. The reversal of 139783381 is 183387931.

139783381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111640356 + 28143025 = 10566^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 139783381 - 2¹ = 139783379 is a prime.

It is a super-2 number, since 2×139783381² = 39078787207582322, which contains 22 as substring.

Together with 139783379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139783321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69891690 + 69891691.

It is an arithmetic number, because the mean of its divisors is an integer number (69891691).

Almost surely, 2^139783381 is an apocalyptic number.

It is an amenable number.

139783381 is a deficient number, since it is larger than the sum of its proper divisors (1).

139783381 is an equidigital number, since it uses as much as digits as its factorization.

139783381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 139783381 is about 11823.0021991032. The cubic root of 139783381 is about 518.9814641133.

The spelling of 139783381 in words is "one hundred thirty-nine million, seven hundred eighty-three thousand, three hundred eighty-one".