815403161 has 4 divisors (see below), whose sum is σ = 825724800. Its totient is φ = 805081524.

The previous prime is 815403157. The next prime is 815403163. The reversal of 815403161 is 161304518.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161304518 = 2 ⋅80652259.

It is a cyclic number.

It is not a de Polignac number, because 815403161 - 2² = 815403157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815403163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5160701 + ... + 5160858.

It is an arithmetic number, because the mean of its divisors is an integer number (206431200).

Almost surely, 2^815403161 is an apocalyptic number.

It is an amenable number.

815403161 is a deficient number, since it is larger than the sum of its proper divisors (10321639).

815403161 is a wasteful number, since it uses less digits than its factorization.

815403161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10321638.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 815403161 is about 28555.2650311637. The cubic root of 815403161 is about 934.2378610167.

Adding to 815403161 its reverse (161304518), we get a palindrome (976707679).

The spelling of 815403161 in words is "eight hundred fifteen million, four hundred three thousand, one hundred sixty-one".