51191994 has 32 divisors (see below), whose sum is σ = 118665216. Its totient is φ = 14419440.

The previous prime is 51191983. The next prime is 51192007. The reversal of 51191994 is 49919115.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5602 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (3708288).

Almost surely, 2^51191994 is an apocalyptic number.

51191994 is an abundant number, since it is smaller than the sum of its proper divisors (67473222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51191994 is a wasteful number, since it uses less digits than its factorization.

51191994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17250.

The product of its digits is 14580, while the sum is 39.

The square root of 51191994 is about 7154.8580698711. The cubic root of 51191994 is about 371.3077512217.

The spelling of 51191994 in words is "fifty-one million, one hundred ninety-one thousand, nine hundred ninety-four".