2161454161 has 8 divisors (see below), whose sum is σ = 2170325160. Its totient is φ = 2152601472.

The previous prime is 2161454149. The next prime is 2161454167. The reversal of 2161454161 is 1614541612.

It can be written as a sum of positive squares in 4 ways, for example, as 433472400 + 1727981761 = 20820^2 + 41569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161454161 - 2⁷ = 2161454033 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161454167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263031 + ... + 271123.

It is an arithmetic number, because the mean of its divisors is an integer number (271290645).

Almost surely, 2^2161454161 is an apocalyptic number.

It is an amenable number.

2161454161 is a deficient number, since it is larger than the sum of its proper divisors (8870999).

2161454161 is an equidigital number, since it uses as much as digits as its factorization.

2161454161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9155.

The product of its digits is 5760, while the sum is 31.

The square root of 2161454161 is about 46491.4418038417. The cubic root of 2161454161 is about 1292.9508318081.

Adding to 2161454161 its reverse (1614541612), we get a palindrome (3775995773).

The spelling of 2161454161 in words is "two billion, one hundred sixty-one million, four hundred fifty-four thousand, one hundred sixty-one".