139001257 has 2 divisors, whose sum is σ = 139001258. Its totient is φ = 139001256.

The previous prime is 139001243. The next prime is 139001273. The reversal of 139001257 is 752100931.

139001257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138980521 + 20736 = 11789^2 + 144^2 .

It is a cyclic number.

It is not a de Polignac number, because 139001257 - 2¹¹ = 138999209 is a prime.

It is not a weakly prime, because it can be changed into another prime (139001287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69500628 + 69500629.

It is an arithmetic number, because the mean of its divisors is an integer number (69500629).

Almost surely, 2^139001257 is an apocalyptic number.

It is an amenable number.

139001257 is a deficient number, since it is larger than the sum of its proper divisors (1).

139001257 is an equidigital number, since it uses as much as digits as its factorization.

139001257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 139001257 is about 11789.8794311053. The cubic root of 139001257 is about 518.0117082171.

The spelling of 139001257 in words is "one hundred thirty-nine million, one thousand, two hundred fifty-seven".