139503109 has 2 divisors, whose sum is σ = 139503110. Its totient is φ = 139503108.

The previous prime is 139503107. The next prime is 139503181. The reversal of 139503109 is 901305931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123876900 + 15626209 = 11130^2 + 3953^2 .

It is an emirp because it is prime and its reverse (901305931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139503109 - 2¹ = 139503107 is a prime.

It is a super-2 number, since 2×139503109² = 38922234841331762, which contains 22 as substring.

Together with 139503107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139503101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69751554 + 69751555.

It is an arithmetic number, because the mean of its divisors is an integer number (69751555).

Almost surely, 2^139503109 is an apocalyptic number.

It is an amenable number.

139503109 is a deficient number, since it is larger than the sum of its proper divisors (1).

139503109 is an equidigital number, since it uses as much as digits as its factorization.

139503109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 139503109 is about 11811.1434247494. The cubic root of 139503109 is about 518.6343715963.

The spelling of 139503109 in words is "one hundred thirty-nine million, five hundred three thousand, one hundred nine".