139002954561 has 9 divisors (see below), whose sum is σ = 200783661091. Its totient is φ = 92667890712.

The previous prime is 139002954553. The next prime is 139002954569. The reversal of 139002954561 is 165459200931.

The square root of 139002954561 is 372831.

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

139002954561 is a `hidden beast` number, since 1 + 39 + 0 + 0 + 2 + 9 + 54 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (139002954553) and next prime (139002954569).

It can be written as a sum of positive squares in only one way, i.e., 43054175025 + 95948779536 = 207495^2 + 309756^2 .

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

It is not a de Polignac number, because 139002954561 - 2³ = 139002954553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139002954569) 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, 1056355 + ... + 1180631.

Almost surely, 2^139002954561 is an apocalyptic number.

139002954561 is the 372831-st square number.

139002954561 is the 186416-th centered octagonal number.

It is an amenable number.

139002954561 is a deficient number, since it is larger than the sum of its proper divisors (61780706530).

139002954561 is an frugal number, since it uses more digits than its factorization.

139002954561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248560 (or 124280 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 139002954561 in words is "one hundred thirty-nine billion, two million, nine hundred fifty-four thousand, five hundred sixty-one".