4005371561 has 2 divisors, whose sum is σ = 4005371562. Its totient is φ = 4005371560.

The previous prime is 4005371477. The next prime is 4005371563. The reversal of 4005371561 is 1651735004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3382120336 + 623251225 = 58156^2 + 24965^2 .

It is a cyclic number.

It is not a de Polignac number, because 4005371561 - 2¹⁴ = 4005355177 is a prime.

Together with 4005371563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4005371563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2002685780 + 2002685781.

It is an arithmetic number, because the mean of its divisors is an integer number (2002685781).

Almost surely, 2^4005371561 is an apocalyptic number.

It is an amenable number.

4005371561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4005371561 is an equidigital number, since it uses as much as digits as its factorization.

4005371561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 4005371561 is about 63288.0048745416. The cubic root of 4005371561 is about 1588.1113025986. Note that the first 3 decimals are identical.

The spelling of 4005371561 in words is "four billion, five million, three hundred seventy-one thousand, five hundred sixty-one".