40891049 has 2 divisors, whose sum is σ = 40891050. Its totient is φ = 40891048.

The previous prime is 40891003. The next prime is 40891051. The reversal of 40891049 is 94019804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 12075625 = 5368^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 40891049 - 2¹² = 40886953 is a prime.

Together with 40891051, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2484593 and since 40891049 and 2484593 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40891849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20445524 + 20445525.

It is an arithmetic number, because the mean of its divisors is an integer number (20445525).

Almost surely, 2^40891049 is an apocalyptic number.

It is an amenable number.

40891049 is a deficient number, since it is larger than the sum of its proper divisors (1).

40891049 is an equidigital number, since it uses as much as digits as its factorization.

40891049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40891049 is about 6394.6109342164. The cubic root of 40891049 is about 344.5160167337.

The spelling of 40891049 in words is "forty million, eight hundred ninety-one thousand, forty-nine".