40001161 has 2 divisors, whose sum is σ = 40001162. Its totient is φ = 40001160.

The previous prime is 40001111. The next prime is 40001173. The reversal of 40001161 is 16110004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36832761 + 3168400 = 6069^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40001161 is a prime.

It is not a weakly prime, because it can be changed into another prime (40001111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000580 + 20000581.

It is an arithmetic number, because the mean of its divisors is an integer number (20000581).

Almost surely, 2^40001161 is an apocalyptic number.

It is an amenable number.

40001161 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001161 is an equidigital number, since it uses as much as digits as its factorization.

40001161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 40001161 is about 6324.6471047798. The cubic root of 40001161 is about 341.9984981068.

Adding to 40001161 its reverse (16110004), we get a palindrome (56111165).

The spelling of 40001161 in words is "forty million, one thousand, one hundred sixty-one".