40163261 has 2 divisors, whose sum is σ = 40163262. Its totient is φ = 40163260.

The previous prime is 40163243. The next prime is 40163273. The reversal of 40163261 is 16236104.

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., 30360100 + 9803161 = 5510^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 40163261 - 2¹⁰ = 40162237 is a prime.

It is a super-2 number, since 2×40163261² = 3226175068308242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40162261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20081630 + 20081631.

It is an arithmetic number, because the mean of its divisors is an integer number (20081631).

Almost surely, 2^40163261 is an apocalyptic number.

It is an amenable number.

40163261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40163261 is an equidigital number, since it uses as much as digits as its factorization.

40163261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40163261 is about 6337.4490924977. The cubic root of 40163261 is about 342.4598450446.

Adding to 40163261 its reverse (16236104), we get a palindrome (56399365).

The spelling of 40163261 in words is "forty million, one hundred sixty-three thousand, two hundred sixty-one".