139505697430009 has 3 divisors (see below), whose sum is σ = 139505709241263. Its totient is φ = 139505685618756.

The previous prime is 139505697429997. The next prime is 139505697430027. The reversal of 139505697430009 is 900034796505931.

The square root of 139505697430009 is 11811253.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 109409194213225 + 30096503216784 = 10459885^2 + 5486028^2 .

It is not a de Polignac number, because 139505697430009 - 2¹⁷ = 139505697298937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139505697430109) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5905627 + ... + 17716879.

It is an arithmetic number, because the mean of its divisors is an integer number (46501903080421).

Almost surely, 2^{139505697430009} is an apocalyptic number.

139505697430009 is the 11811253-rd square number.

139505697430009 is the 5905627-th centered octagonal number.

It is an amenable number.

139505697430009 is a deficient number, since it is larger than the sum of its proper divisors (11811254).

139505697430009 is an frugal number, since it uses more digits than its factorization.

139505697430009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23622506 (or 11811253 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 61.

The spelling of 139505697430009 in words is "one hundred thirty-nine trillion, five hundred five billion, six hundred ninety-seven million, four hundred thirty thousand, nine".