139494033121 has 3 divisors (see below), whose sum is σ = 139494406611. Its totient is φ = 139493659632.

The previous prime is 139494033113. The next prime is 139494033179. The reversal of 139494033121 is 121330494931.

The square root of 139494033121 is 373489.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121330494931 = 43 ⋅2821639417.

It can be written as a sum of positive squares in only one way, i.e., 1645194721 + 137848838400 = 40561^2 + 371280^2 .

It is not a de Polignac number, because 139494033121 - 2³ = 139494033113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139494633121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 186745 + ... + 560233.

It is an arithmetic number, because the mean of its divisors is an integer number (46498135537).

Almost surely, 2^139494033121 is an apocalyptic number.

139494033121 is the 373489-th square number.

139494033121 is the 186745-th centered octagonal number.

It is an amenable number.

139494033121 is a deficient number, since it is larger than the sum of its proper divisors (373490).

139494033121 is an frugal number, since it uses more digits than its factorization.

139494033121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746978 (or 373489 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 139494033121 in words is "one hundred thirty-nine billion, four hundred ninety-four million, thirty-three thousand, one hundred twenty-one".