405511130491 has 4 divisors (see below), whose sum is σ = 423142049232. Its totient is φ = 387880211752.

The previous prime is 405511130473. The next prime is 405511130513. The reversal of 405511130491 is 194031115504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405511130491 - 2²³ = 405502741883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405511130191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8815459336 + ... + 8815459381.

It is an arithmetic number, because the mean of its divisors is an integer number (105785512308).

Almost surely, 2^405511130491 is an apocalyptic number.

405511130491 is a deficient number, since it is larger than the sum of its proper divisors (17630918741).

405511130491 is a wasteful number, since it uses less digits than its factorization.

405511130491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17630918740.

The product of its (nonzero) digits is 10800, while the sum is 34.

Adding to 405511130491 its reverse (194031115504), we get a palindrome (599542245995).

The spelling of 405511130491 in words is "four hundred five billion, five hundred eleven million, one hundred thirty thousand, four hundred ninety-one".