139052172609 has 63 divisors (see below), whose sum is σ = 242643891603. Its totient is φ = 79418111472.

The previous prime is 139052172607. The next prime is 139052172629. The reversal of 139052172609 is 906271250931.

It is a happy number.

The square root of 139052172609 is 372897.

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

139052172609 is a `hidden beast` number, since 1 + 39 + 0 + 5 + 2 + 1 + 7 + 2 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29906514225 + 109145658384 = 172935^2 + 330372^2 .

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 139052172609 - 2¹ = 139052172607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139052172607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 70476547 + ... + 70478519.

Almost surely, 2^139052172609 is an apocalyptic number.

139052172609 is the 372897-th square number.

139052172609 is the 186449-th centered octagonal number.

It is an amenable number.

139052172609 is a deficient number, since it is larger than the sum of its proper divisors (103591718994).

139052172609 is an frugal number, since it uses more digits than its factorization.

139052172609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 139052172609 in words is "one hundred thirty-nine billion, fifty-two million, one hundred seventy-two thousand, six hundred nine".