511005109991 has 8 divisors (see below), whose sum is σ = 537966546480. Its totient is φ = 484050316608.

The previous prime is 511005109973. The next prime is 511005110069. The reversal of 511005109991 is 199901500115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511005109991 is a prime.

It is a super-2 number, since 2×511005109991² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511005109691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1502486 + ... + 1810931.

It is an arithmetic number, because the mean of its divisors is an integer number (67245818310).

Almost surely, 2^511005109991 is an apocalyptic number.

511005109991 is a deficient number, since it is larger than the sum of its proper divisors (26961436489).

511005109991 is a wasteful number, since it uses less digits than its factorization.

511005109991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321553.

The product of its (nonzero) digits is 18225, while the sum is 41.

The spelling of 511005109991 in words is "five hundred eleven billion, five million, one hundred nine thousand, nine hundred ninety-one".