139392761 has 2 divisors, whose sum is σ = 139392762. Its totient is φ = 139392760.

The previous prime is 139392749. The next prime is 139392791. The reversal of 139392761 is 167293931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106399225 + 32993536 = 10315^2 + 5744^2 .

It is a cyclic number.

It is not a de Polignac number, because 139392761 - 2¹⁰ = 139391737 is a prime.

It is not a weakly prime, because it can be changed into another prime (139392791) 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 as a sum of consecutive naturals, namely, 69696380 + 69696381.

It is an arithmetic number, because the mean of its divisors is an integer number (69696381).

Almost surely, 2^139392761 is an apocalyptic number.

It is an amenable number.

139392761 is a deficient number, since it is larger than the sum of its proper divisors (1).

139392761 is an equidigital number, since it uses as much as digits as its factorization.

139392761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 41.

The square root of 139392761 is about 11806.4711493316. The cubic root of 139392761 is about 518.4975876385.

The spelling of 139392761 in words is "one hundred thirty-nine million, three hundred ninety-two thousand, seven hundred sixty-one".