139590409921 has 2 divisors, whose sum is σ = 139590409922. Its totient is φ = 139590409920.

The previous prime is 139590409913. The next prime is 139590409943. The reversal of 139590409921 is 129904095931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125390351025 + 14200058896 = 354105^2 + 119164^2 .

It is an emirp because it is prime and its reverse (129904095931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139590409921 - 2³ = 139590409913 is a prime.

It is not a weakly prime, because it can be changed into another prime (139590409421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69795204960 + 69795204961.

It is an arithmetic number, because the mean of its divisors is an integer number (69795204961).

Almost surely, 2^139590409921 is an apocalyptic number.

It is an amenable number.

139590409921 is a deficient number, since it is larger than the sum of its proper divisors (1).

139590409921 is an equidigital number, since it uses as much as digits as its factorization.

139590409921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 787320, while the sum is 52.

The spelling of 139590409921 in words is "one hundred thirty-nine billion, five hundred ninety million, four hundred nine thousand, nine hundred twenty-one".