139361102721 has 15 divisors (see below), whose sum is σ = 208186419441. Its totient is φ = 92905161948.

The previous prime is 139361102687. The next prime is 139361102729. The reversal of 139361102721 is 127201163931.

The square root of 139361102721 is 373311.

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

139361102721 is a `hidden beast` number, since 1 + 39 + 3 + 611 + 0 + 2 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 139361102721 - 2⁷ = 139361102593 is a prime.

It is a super-2 number, since 2×139361102721² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139361102729) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3339060 + ... + 3380538.

Almost surely, 2^139361102721 is an apocalyptic number.

139361102721 is the 373311-st square number.

139361102721 is the 186656-th centered octagonal number.

It is an amenable number.

139361102721 is a deficient number, since it is larger than the sum of its proper divisors (68825316720).

139361102721 is an frugal number, since it uses more digits than its factorization.

139361102721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82970 (or 41482 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

Multiplying 139361102721 by its sum of digits (36), we get a square (5016999697956 = 2239866²).

The spelling of 139361102721 in words is "one hundred thirty-nine billion, three hundred sixty-one million, one hundred two thousand, seven hundred twenty-one".