139814509 has 2 divisors, whose sum is σ = 139814510. Its totient is φ = 139814508.

The previous prime is 139814473. The next prime is 139814531. The reversal of 139814509 is 905418931.

139814509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137992009 + 1822500 = 11747^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 139814509 - 2¹¹ = 139812461 is a prime.

It is a super-2 number, since 2×139814509² = 39096193853822162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139814809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69907254 + 69907255.

It is an arithmetic number, because the mean of its divisors is an integer number (69907255).

Almost surely, 2^139814509 is an apocalyptic number.

It is an amenable number.

139814509 is a deficient number, since it is larger than the sum of its proper divisors (1).

139814509 is an equidigital number, since it uses as much as digits as its factorization.

139814509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 139814509 is about 11824.3185427322. The cubic root of 139814509 is about 519.0199848012.

The spelling of 139814509 in words is "one hundred thirty-nine million, eight hundred fourteen thousand, five hundred nine".