4021511161 has 2 divisors, whose sum is σ = 4021511162. Its totient is φ = 4021511160.

The previous prime is 4021511159. The next prime is 4021511173. The reversal of 4021511161 is 1611151204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2729540025 + 1291971136 = 52245^2 + 35944^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021511161 - 2¹ = 4021511159 is a prime.

Together with 4021511159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4021511561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010755580 + 2010755581.

It is an arithmetic number, because the mean of its divisors is an integer number (2010755581).

Almost surely, 2^4021511161 is an apocalyptic number.

It is an amenable number.

4021511161 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021511161 is an equidigital number, since it uses as much as digits as its factorization.

4021511161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 4021511161 is about 63415.3858381387. The cubic root of 4021511161 is about 1590.2415361609.

Adding to 4021511161 its reverse (1611151204), we get a palindrome (5632662365).

The spelling of 4021511161 in words is "four billion, twenty-one million, five hundred eleven thousand, one hundred sixty-one".