861958025 has 6 divisors (see below), whose sum is σ = 1068827982. Its totient is φ = 689566400.

The previous prime is 861958003. The next prime is 861958037. The reversal of 861958025 is 520859168.

861958025 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 3 ways, for example, as 226111369 + 635846656 = 15037^2 + 25216^2 .

It is not a de Polignac number, because 861958025 - 2⁶ = 861957961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17239136 + ... + 17239185.

It is an arithmetic number, because the mean of its divisors is an integer number (178137997).

Almost surely, 2^861958025 is an apocalyptic number.

It is an amenable number.

861958025 is a deficient number, since it is larger than the sum of its proper divisors (206869957).

861958025 is a wasteful number, since it uses less digits than its factorization.

861958025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34478331 (or 34478326 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 861958025 is about 29359.1216660172. The cubic root of 861958025 is about 951.6897075191.

The spelling of 861958025 in words is "eight hundred sixty-one million, nine hundred fifty-eight thousand, twenty-five".