139557601 has 2 divisors, whose sum is σ = 139557602. Its totient is φ = 139557600.

The previous prime is 139557581. The next prime is 139557631. The reversal of 139557601 is 106755931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129413376 + 10144225 = 11376^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 139557601 - 2¹¹ = 139555553 is a prime.

It is not a weakly prime, because it can be changed into another prime (139557631) 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, 69778800 + 69778801.

It is an arithmetic number, because the mean of its divisors is an integer number (69778801).

Almost surely, 2^139557601 is an apocalyptic number.

It is an amenable number.

139557601 is a deficient number, since it is larger than the sum of its proper divisors (1).

139557601 is an equidigital number, since it uses as much as digits as its factorization.

139557601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 139557601 is about 11813.4500041267. The cubic root of 139557601 is about 518.7018915854.

It can be divided in two parts, 1395 and 57601, that added together give a triangular number (58996 = T₃₄₃).

The spelling of 139557601 in words is "one hundred thirty-nine million, five hundred fifty-seven thousand, six hundred one".