40085561 has 2 divisors, whose sum is σ = 40085562. Its totient is φ = 40085560.

The previous prime is 40085519. The next prime is 40085567. The reversal of 40085561 is 16558004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37589161 + 2496400 = 6131^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 40085561 - 2¹⁰ = 40084537 is a prime.

It is not a weakly prime, because it can be changed into another prime (40085567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20042780 + 20042781.

It is an arithmetic number, because the mean of its divisors is an integer number (20042781).

Almost surely, 2^40085561 is an apocalyptic number.

It is an amenable number.

40085561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40085561 is an equidigital number, since it uses as much as digits as its factorization.

40085561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 40085561 is about 6331.3158979789. The cubic root of 40085561 is about 342.2388610978.

The spelling of 40085561 in words is "forty million, eighty-five thousand, five hundred sixty-one".