139964661 has 6 divisors (see below), whose sum is σ = 202171190. Its totient is φ = 93309768.

The previous prime is 139964651. The next prime is 139964681. The reversal of 139964661 is 166469931.

It can be written as a sum of positive squares in only one way, i.e., 86601636 + 53363025 = 9306^2 + 7305^2 .

It is not a de Polignac number, because 139964661 - 2⁷ = 139964533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139964641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7775806 + ... + 7775823.

Almost surely, 2^139964661 is an apocalyptic number.

It is an amenable number.

139964661 is a deficient number, since it is larger than the sum of its proper divisors (62206529).

139964661 is a wasteful number, since it uses less digits than its factorization.

139964661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15551635 (or 15551632 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 139964661 is about 11830.6661266389. Note that the first 3 decimals coincide. The cubic root of 139964661 is about 519.2057166159.

It can be divided in two parts, 139964 and 661, that added together give a square (140625 = 375²).

The spelling of 139964661 in words is "one hundred thirty-nine million, nine hundred sixty-four thousand, six hundred sixty-one".