40919491 has 2 divisors, whose sum is σ = 40919492. Its totient is φ = 40919490.

The previous prime is 40919479. The next prime is 40919569. The reversal of 40919491 is 19491904.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40919491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40919491.

It is not a weakly prime, because it can be changed into another prime (40919401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20459745 + 20459746.

It is an arithmetic number, because the mean of its divisors is an integer number (20459746).

Almost surely, 2^40919491 is an apocalyptic number.

40919491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40919491 is an equidigital number, since it uses as much as digits as its factorization.

40919491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 40919491 is about 6396.8344515080. The cubic root of 40919491 is about 344.5958749081.

It can be divided in two parts, 409 and 19491, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 40919491 in words is "forty million, nine hundred nineteen thousand, four hundred ninety-one".