139321601 has 2 divisors, whose sum is σ = 139321602. Its totient is φ = 139321600.

The previous prime is 139321561. The next prime is 139321619. The reversal of 139321601 is 106123931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84916225 + 54405376 = 9215^2 + 7376^2 .

It is an emirp because it is prime and its reverse (106123931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139321601 - 2¹⁴ = 139305217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139321801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69660800 + 69660801.

It is an arithmetic number, because the mean of its divisors is an integer number (69660801).

Almost surely, 2^139321601 is an apocalyptic number.

It is an amenable number.

139321601 is a deficient number, since it is larger than the sum of its proper divisors (1).

139321601 is an equidigital number, since it uses as much as digits as its factorization.

139321601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 139321601 is about 11803.4571630518. The cubic root of 139321601 is about 518.4093416197.

The spelling of 139321601 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, six hundred one".