2118405951 has 6 divisors (see below), whose sum is σ = 3059919720. Its totient is φ = 1412270628.

The previous prime is 2118405911. The next prime is 2118405967. The reversal of 2118405951 is 1595048112.

2118405951 is a `hidden beast` number, since 21 + 1 + 8 + 40 + 595 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2118405951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118405901) 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 5 ways as a sum of consecutive naturals, for example, 117689211 + ... + 117689228.

It is an arithmetic number, because the mean of its divisors is an integer number (509986620).

Almost surely, 2^2118405951 is an apocalyptic number.

2118405951 is a deficient number, since it is larger than the sum of its proper divisors (941513769).

2118405951 is a wasteful number, since it uses less digits than its factorization.

2118405951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235378445 (or 235378442 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 2118405951 is about 46026.1442117412. The cubic root of 2118405951 is about 1284.3096012236.

The spelling of 2118405951 in words is "two billion, one hundred eighteen million, four hundred five thousand, nine hundred fifty-one".