139787002161 has 27 divisors (see below), whose sum is σ = 214519813963. Its totient is φ = 87697527360.

The previous prime is 139787002073. The next prime is 139787002177. The reversal of 139787002161 is 161200787931.

The square root of 139787002161 is 373881.

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

It can be written as a sum of positive squares in only one way, i.e., 108830711025 + 30956291136 = 329895^2 + 175944^2 .

It is not a de Polignac number, because 139787002161 - 2⁹ = 139787001649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139787009161) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19064266 + ... + 19071596.

Almost surely, 2^139787002161 is an apocalyptic number.

139787002161 is the 373881-st square number.

139787002161 is the 186941-st centered octagonal number.

It is an amenable number.

139787002161 is a deficient number, since it is larger than the sum of its proper divisors (74732811802).

139787002161 is an frugal number, since it uses more digits than its factorization.

139787002161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14702 (or 7351 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 139787002161 in words is "one hundred thirty-nine billion, seven hundred eighty-seven million, two thousand, one hundred sixty-one".