40775561 has 2 divisors, whose sum is σ = 40775562. Its totient is φ = 40775560.

The previous prime is 40775557. The next prime is 40775563. The reversal of 40775561 is 16557704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25806400 + 14969161 = 5080^2 + 3869^2 .

It is a cyclic number.

It is not a de Polignac number, because 40775561 - 2² = 40775557 is a prime.

Together with 40775563, 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 (40775563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20387780 + 20387781.

It is an arithmetic number, because the mean of its divisors is an integer number (20387781).

Almost surely, 2^40775561 is an apocalyptic number.

It is an amenable number.

40775561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40775561 is an equidigital number, since it uses as much as digits as its factorization.

40775561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 40775561 is about 6385.5744455765. The cubic root of 40775561 is about 344.1913737074.

The spelling of 40775561 in words is "forty million, seven hundred seventy-five thousand, five hundred sixty-one".