139890212361 has 9 divisors (see below), whose sum is σ = 202065260839. Its totient is φ = 93259393536.

The previous prime is 139890212333. The next prime is 139890212369. The reversal of 139890212361 is 163212098931.

It is a happy number.

The square root of 139890212361 is 374019.

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

139890212361 is a `hidden beast` number, since 1 + 398 + 9 + 0 + 21 + 236 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 139603113225 + 287099136 = 373635^2 + 16944^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 139890212361 - 2⁷ = 139890212233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139890212369) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1059721 + ... + 1184393.

Almost surely, 2^139890212361 is an apocalyptic number.

139890212361 is the 374019-th square number.

139890212361 is the 187010-th centered octagonal number.

It is an amenable number.

139890212361 is a deficient number, since it is larger than the sum of its proper divisors (62175048478).

139890212361 is an frugal number, since it uses more digits than its factorization.

139890212361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249352 (or 124676 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 139890212361 in words is "one hundred thirty-nine billion, eight hundred ninety million, two hundred twelve thousand, three hundred sixty-one".