40149761 has 2 divisors, whose sum is σ = 40149762. Its totient is φ = 40149760.

The previous prime is 40149757. The next prime is 40149763. The reversal of 40149761 is 16794104.

40149761 = 4480² + 4481².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 20070400 = 4481^2 + 4480^2 .

It is a cyclic number.

It is not a de Polignac number, because 40149761 - 2² = 40149757 is a prime.

It is a super-2 number, since 2×40149761² = 3224006616714242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40149763, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40149763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20074880 + 20074881.

It is an arithmetic number, because the mean of its divisors is an integer number (20074881).

Almost surely, 2^40149761 is an apocalyptic number.

40149761 is the 4481-st centered square number.

It is an amenable number.

40149761 is a deficient number, since it is larger than the sum of its proper divisors (1).

40149761 is an equidigital number, since it uses as much as digits as its factorization.

40149761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 40149761 is about 6336.3839056673. The cubic root of 40149761 is about 342.4214706208.

The spelling of 40149761 in words is "forty million, one hundred forty-nine thousand, seven hundred sixty-one".