40491081 has 6 divisors (see below), whose sum is σ = 58487130. Its totient is φ = 26994048.

The previous prime is 40491049. The next prime is 40491089. The reversal of 40491081 is 18019404.

It can be written as a sum of positive squares in only one way, i.e., 36723600 + 3767481 = 6060^2 + 1941^2 .

It is not a de Polignac number, because 40491081 - 2⁵ = 40491049 is a prime.

It is a super-2 number, since 2×40491081² = 3279055281097122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40491089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2249496 + ... + 2249513.

It is an arithmetic number, because the mean of its divisors is an integer number (9747855).

Almost surely, 2^40491081 is an apocalyptic number.

It is an amenable number.

40491081 is a deficient number, since it is larger than the sum of its proper divisors (17996049).

40491081 is a wasteful number, since it uses less digits than its factorization.

40491081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499015 (or 4499012 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 40491081 is about 6363.2602492747. The cubic root of 40491081 is about 343.3890617638.

The spelling of 40491081 in words is "forty million, four hundred ninety-one thousand, eighty-one".