825161261 has 4 divisors (see below), whose sum is σ = 829308000. Its totient is φ = 821014524.

The previous prime is 825161251. The next prime is 825161269. The reversal of 825161261 is 162161528.

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 825161261 - 2²² = 820966957 is a prime.

It is a super-2 number, since 2×825161261² = 1361782213310220242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825161269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073071 + ... + 2073468.

It is an arithmetic number, because the mean of its divisors is an integer number (207327000).

Almost surely, 2^825161261 is an apocalyptic number.

It is an amenable number.

825161261 is a deficient number, since it is larger than the sum of its proper divisors (4146739).

825161261 is a wasteful number, since it uses less digits than its factorization.

825161261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146738.

The product of its digits is 5760, while the sum is 32.

The square root of 825161261 is about 28725.6202892122. The cubic root of 825161261 is about 937.9498327423.

The spelling of 825161261 in words is "eight hundred twenty-five million, one hundred sixty-one thousand, two hundred sixty-one".