501000005091 has 16 divisors (see below), whose sum is σ = 697061456640. Its totient is φ = 319470027360.

The previous prime is 501000005053. The next prime is 501000005111. The reversal of 501000005091 is 190500000105.

It is a happy number.

It is not a de Polignac number, because 501000005091 - 2⁹ = 501000004579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (501000005021) 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 15 ways as a sum of consecutive naturals, for example, 3719796 + ... + 3852126.

It is an arithmetic number, because the mean of its divisors is an integer number (43566341040).

Almost surely, 2^501000005091 is an apocalyptic number.

501000005091 is a deficient number, since it is larger than the sum of its proper divisors (196061451549).

501000005091 is a wasteful number, since it uses less digits than its factorization.

501000005091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187226.

The product of its (nonzero) digits is 225, while the sum is 21.

Adding to 501000005091 its reverse (190500000105), we get a palindrome (691500005196).

The spelling of 501000005091 in words is "five hundred one billion, five thousand, ninety-one".