139235731 has 2 divisors, whose sum is σ = 139235732. Its totient is φ = 139235730.

The previous prime is 139235711. The next prime is 139235771. The reversal of 139235731 is 137532931.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (137532931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139235731 - 2¹¹ = 139233683 is a prime.

It is a super-2 number, since 2×139235731² = 38773177574208722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139235711) 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, 69617865 + 69617866.

It is an arithmetic number, because the mean of its divisors is an integer number (69617866).

Almost surely, 2^139235731 is an apocalyptic number.

139235731 is a deficient number, since it is larger than the sum of its proper divisors (1).

139235731 is an equidigital number, since it uses as much as digits as its factorization.

139235731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 34.

The square root of 139235731 is about 11799.8191087830. The cubic root of 139235731 is about 518.3028136091.

The spelling of 139235731 in words is "one hundred thirty-nine million, two hundred thirty-five thousand, seven hundred thirty-one".