139240001 has 2 divisors, whose sum is σ = 139240002. Its totient is φ = 139240000.

The previous prime is 139239937. The next prime is 139240009. The reversal of 139240001 is 100042931.

It is a Cunningham number, because it is equal to 11800²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139240000 + 1 = 11800^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 139240001 - 2⁶ = 139239937 is a prime.

It is not a weakly prime, because it can be changed into another prime (139240009) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69620000 + 69620001.

It is an arithmetic number, because the mean of its divisors is an integer number (69620001).

Almost surely, 2^139240001 is an apocalyptic number.

It is an amenable number.

139240001 is a deficient number, since it is larger than the sum of its proper divisors (1).

139240001 is an equidigital number, since it uses as much as digits as its factorization.

139240001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 139240001 is about 11800.0000423729. Note that the first 4 decimals coincide. The cubic root of 139240001 is about 518.3081118908.

Adding to 139240001 its reverse (100042931), we get a palindrome (239282932).

The spelling of 139240001 in words is "one hundred thirty-nine million, two hundred forty thousand, one".