2161626241 has 4 divisors (see below), whose sum is σ = 2161999684. Its totient is φ = 2161252800.

The previous prime is 2161626239. The next prime is 2161626251. The reversal of 2161626241 is 1426261612.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1422873841 + 738752400 = 37721^2 + 27180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161626241 - 2¹ = 2161626239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161626251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177900 + ... + 189661.

It is an arithmetic number, because the mean of its divisors is an integer number (540499921).

Almost surely, 2^2161626241 is an apocalyptic number.

It is an amenable number.

2161626241 is a deficient number, since it is larger than the sum of its proper divisors (373443).

2161626241 is an equidigital number, since it uses as much as digits as its factorization.

2161626241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373442.

The product of its digits is 6912, while the sum is 31.

The square root of 2161626241 is about 46493.2924301990. The cubic root of 2161626241 is about 1292.9851428257.

Adding to 2161626241 its reverse (1426261612), we get a palindrome (3587887853).

The spelling of 2161626241 in words is "two billion, one hundred sixty-one million, six hundred twenty-six thousand, two hundred forty-one".