139954551025 has 9 divisors (see below), whose sum is σ = 173545962753. Its totient is φ = 111962144400.

The previous prime is 139954551013. The next prime is 139954551049. The reversal of 139954551025 is 520155459931.

It is a happy number.

The square root of 139954551025 is 374105.

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

139954551025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5106960369 + 134847590656 = 71463^2 + 367216^2 .

It is not a de Polignac number, because 139954551025 - 2⁵ = 139954550993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139954551025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1833115 + ... + 1907935.

Almost surely, 2^139954551025 is an apocalyptic number.

139954551025 is the 374105-th square number.

139954551025 is the 187053-rd centered octagonal number.

It is an amenable number.

139954551025 is a deficient number, since it is larger than the sum of its proper divisors (33591411728).

139954551025 is an frugal number, since it uses more digits than its factorization.

139954551025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149652 (or 74826 counting only the distinct ones).

The product of its (nonzero) digits is 1215000, while the sum is 49.

Multiplying 139954551025 by its sum of digits (49), we get a square (6857773000225 = 2618735²).

The spelling of 139954551025 in words is "one hundred thirty-nine billion, nine hundred fifty-four million, five hundred fifty-one thousand, twenty-five".