511111913 has 16 divisors (see below), whose sum is σ = 590345280. Its totient is φ = 438519744.

The previous prime is 511111907. The next prime is 511111927. The reversal of 511111913 is 319111115.

It is not a de Polignac number, because 511111913 - 2¹⁸ = 510849769 is a prime.

It is a super-2 number, since 2×511111913² = 522470775221039138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511111903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6431 + ... + 32612.

It is an arithmetic number, because the mean of its divisors is an integer number (36896580).

Almost surely, 2^511111913 is an apocalyptic number.

511111913 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

511111913 is a deficient number, since it is larger than the sum of its proper divisors (79233367).

511111913 is a wasteful number, since it uses less digits than its factorization.

511111913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39128.

The product of its digits is 135, while the sum is 23.

The square root of 511111913 is about 22607.7843452206. The cubic root of 511111913 is about 799.5371869943.

The spelling of 511111913 in words is "five hundred eleven million, one hundred eleven thousand, nine hundred thirteen".