139781441 has 2 divisors, whose sum is σ = 139781442. Its totient is φ = 139781440.

The previous prime is 139781437. The next prime is 139781459. The reversal of 139781441 is 144187931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86564416 + 53217025 = 9304^2 + 7295^2 .

It is a cyclic number.

It is not a de Polignac number, because 139781441 - 2² = 139781437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 139781395 and 139781404.

It is not a weakly prime, because it can be changed into another prime (139781401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69890720 + 69890721.

It is an arithmetic number, because the mean of its divisors is an integer number (69890721).

Almost surely, 2^139781441 is an apocalyptic number.

It is an amenable number.

139781441 is a deficient number, since it is larger than the sum of its proper divisors (1).

139781441 is an equidigital number, since it uses as much as digits as its factorization.

139781441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 139781441 is about 11822.9201553593. The cubic root of 139781441 is about 518.9790631872.

The spelling of 139781441 in words is "one hundred thirty-nine million, seven hundred eighty-one thousand, four hundred forty-one".