40075561 has 2 divisors, whose sum is σ = 40075562. Its totient is φ = 40075560.

The previous prime is 40075559. The next prime is 40075577. The reversal of 40075561 is 16557004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37454400 + 2621161 = 6120^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 40075561 - 2¹ = 40075559 is a prime.

Together with 40075559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40075501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20037780 + 20037781.

It is an arithmetic number, because the mean of its divisors is an integer number (20037781).

Almost surely, 2^40075561 is an apocalyptic number.

It is an amenable number.

40075561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40075561 is an equidigital number, since it uses as much as digits as its factorization.

40075561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 40075561 is about 6330.5261234750. The cubic root of 40075561 is about 342.2103997004.

The spelling of 40075561 in words is "forty million, seventy-five thousand, five hundred sixty-one".