40811009 has 4 divisors (see below), whose sum is σ = 40830720. Its totient is φ = 40791300.

The previous prime is 40811003. The next prime is 40811011. The reversal of 40811009 is 90011804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40811009 - 2²⁰ = 39762433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40811003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6329 + ... + 11030.

It is an arithmetic number, because the mean of its divisors is an integer number (10207680).

Almost surely, 2^40811009 is an apocalyptic number.

It is an amenable number.

40811009 is a deficient number, since it is larger than the sum of its proper divisors (19711).

40811009 is a wasteful number, since it uses less digits than its factorization.

40811009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19710.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 40811009 is about 6388.3494738469. The cubic root of 40811009 is about 344.2910850838.

The spelling of 40811009 in words is "forty million, eight hundred eleven thousand, nine".