139771601 has 2 divisors, whose sum is σ = 139771602. Its totient is φ = 139771600.

The previous prime is 139771571. The next prime is 139771627. The reversal of 139771601 is 106177931.

139771601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91107025 + 48664576 = 9545^2 + 6976^2 .

It is an emirp because it is prime and its reverse (106177931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139771601 - 2¹⁰ = 139770577 is a prime.

It is a super-2 number, since 2×139771601² = 39072200892206402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (139771661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69885800 + 69885801.

It is an arithmetic number, because the mean of its divisors is an integer number (69885801).

Almost surely, 2^139771601 is an apocalyptic number.

It is an amenable number.

139771601 is a deficient number, since it is larger than the sum of its proper divisors (1).

139771601 is an equidigital number, since it uses as much as digits as its factorization.

139771601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 139771601 is about 11822.5040071890. The cubic root of 139771601 is about 518.9668849519.

The spelling of 139771601 in words is "one hundred thirty-nine million, seven hundred seventy-one thousand, six hundred one".