7191888025 has 27 divisors (see below), whose sum is σ = 10378214751. Its totient is φ = 4929545040.

The previous prime is 7191888001. The next prime is 7191888043. The reversal of 7191888025 is 5208881917.

The square root of 7191888025 is 84805.

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

It can be written as a sum of positive squares in only one way, i.e., 2589079689 + 4602808336 = 50883^2 + 67844^2 .

It is not a de Polignac number, because 7191888025 - 2⁹ = 7191887513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

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 7191888025.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2966964 + ... + 2969386.

Almost surely, 2^7191888025 is an apocalyptic number.

7191888025 is the 84805-th square number.

7191888025 is the 42403-rd centered octagonal number.

It is an amenable number.

7191888025 is a deficient number, since it is larger than the sum of its proper divisors (3186326726).

7191888025 is an frugal number, since it uses more digits than its factorization.

7191888025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4870 (or 2435 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 49.

The cubic root of 7191888025 is about 1930.2533091238.

Multiplying 7191888025 by its sum of digits (49), we get a square (352402513225 = 593635²).

7191888025 divided by its sum of digits (49) gives a square (146773225 = 12115²).

The spelling of 7191888025 in words is "seven billion, one hundred ninety-one million, eight hundred eighty-eight thousand, twenty-five".