825172961 has 4 divisors (see below), whose sum is σ = 825807552. Its totient is φ = 824538372.

The previous prime is 825172951. The next prime is 825172963. The reversal of 825172961 is 169271528.

825172961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 825172961 - 2⁶ = 825172897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825172963) 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, 315341 + ... + 317946.

It is an arithmetic number, because the mean of its divisors is an integer number (206451888).

Almost surely, 2^825172961 is an apocalyptic number.

It is an amenable number.

825172961 is a deficient number, since it is larger than the sum of its proper divisors (634591).

825172961 is a wasteful number, since it uses less digits than its factorization.

825172961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634590.

The product of its digits is 60480, while the sum is 41.

The square root of 825172961 is about 28725.8239394451. The cubic root of 825172961 is about 937.9542657995.

The spelling of 825172961 in words is "eight hundred twenty-five million, one hundred seventy-two thousand, nine hundred sixty-one".