139129901 has 2 divisors, whose sum is σ = 139129902. Its totient is φ = 139129900.

The previous prime is 139129877. The next prime is 139129927. The reversal of 139129901 is 109921931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74407876 + 64722025 = 8626^2 + 8045^2 .

It is a cyclic number.

It is not a de Polignac number, because 139129901 - 2¹⁴ = 139113517 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139129801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69564950 + 69564951.

It is an arithmetic number, because the mean of its divisors is an integer number (69564951).

Almost surely, 2^139129901 is an apocalyptic number.

It is an amenable number.

139129901 is a deficient number, since it is larger than the sum of its proper divisors (1).

139129901 is an equidigital number, since it uses as much as digits as its factorization.

139129901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 139129901 is about 11795.3338655589. Note that the first 3 decimals coincide. The cubic root of 139129901 is about 518.1714634891.

The spelling of 139129901 in words is "one hundred thirty-nine million, one hundred twenty-nine thousand, nine hundred one".