825980861 has 4 divisors (see below), whose sum is σ = 826190400. Its totient is φ = 825771324.

The previous prime is 825980839. The next prime is 825980873. The reversal of 825980861 is 168089528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 825980861 - 2⁶ = 825980797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825980161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98741 + ... + 106778.

It is an arithmetic number, because the mean of its divisors is an integer number (206547600).

Almost surely, 2^825980861 is an apocalyptic number.

It is an amenable number.

825980861 is a deficient number, since it is larger than the sum of its proper divisors (209539).

825980861 is a wasteful number, since it uses less digits than its factorization.

825980861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209538.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 825980861 is about 28739.8827589815. The cubic root of 825980861 is about 938.2602727895.

The spelling of 825980861 in words is "eight hundred twenty-five million, nine hundred eighty thousand, eight hundred sixty-one".