826440161 has 4 divisors (see below), whose sum is σ = 830049300. Its totient is φ = 822831024.

The previous prime is 826440143. The next prime is 826440179. The reversal of 826440161 is 161044628.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (826440143) and next prime (826440179).

It can be written as a sum of positive squares in 2 ways, for example, as 659513761 + 166926400 = 25681^2 + 12920^2 .

It is a cyclic number.

It is not a de Polignac number, because 826440161 - 2¹⁴ = 826423777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (826440661) 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, 1804226 + ... + 1804683.

It is an arithmetic number, because the mean of its divisors is an integer number (207512325).

Almost surely, 2^826440161 is an apocalyptic number.

It is an amenable number.

826440161 is a deficient number, since it is larger than the sum of its proper divisors (3609139).

826440161 is a wasteful number, since it uses less digits than its factorization.

826440161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609138.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 826440161 is about 28747.8722864841. The cubic root of 826440161 is about 938.4341521575.

Adding to 826440161 its reverse (161044628), we get a palindrome (987484789).

The spelling of 826440161 in words is "eight hundred twenty-six million, four hundred forty thousand, one hundred sixty-one".