5511981951 has 24 divisors (see below), whose sum is σ = 9114347424. Its totient is φ = 3144441600.

The previous prime is 5511981949. The next prime is 5511981967. The reversal of 5511981951 is 1591891155.

5511981951 is a `hidden beast` number, since 5 + 511 + 9 + 81 + 9 + 51 = 666.

It is not a de Polignac number, because 5511981951 - 2¹ = 5511981949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5511981897 and 5511981906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5511981931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34926 + ... + 110651.

It is an arithmetic number, because the mean of its divisors is an integer number (379764476).

Almost surely, 2^5511981951 is an apocalyptic number.

5511981951 is a deficient number, since it is larger than the sum of its proper divisors (3602365473).

5511981951 is a wasteful number, since it uses less digits than its factorization.

5511981951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146191 (or 146188 counting only the distinct ones).

The product of its digits is 81000, while the sum is 45.

The square root of 5511981951 is about 74242.7232191816. The cubic root of 5511981951 is about 1766.4550700930.

The spelling of 5511981951 in words is "five billion, five hundred eleven million, nine hundred eighty-one thousand, nine hundred fifty-one".