825997191 has 16 divisors (see below), whose sum is σ = 1128167040. Its totient is φ = 537274080.

The previous prime is 825997187. The next prime is 825997231. The reversal of 825997191 is 191799528.

It is not a de Polignac number, because 825997191 - 2² = 825997187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825997181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137805 + ... + 143673.

It is an arithmetic number, because the mean of its divisors is an integer number (70510440).

Almost surely, 2^825997191 is an apocalyptic number.

825997191 is a deficient number, since it is larger than the sum of its proper divisors (302169849).

825997191 is a wasteful number, since it uses less digits than its factorization.

825997191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006.

The product of its digits is 408240, while the sum is 51.

The square root of 825997191 is about 28740.1668575532. The cubic root of 825997191 is about 938.2664560196.

The spelling of 825997191 in words is "eight hundred twenty-five million, nine hundred ninety-seven thousand, one hundred ninety-one".