51814691 has 12 divisors (see below), whose sum is σ = 57908952. Its totient is φ = 46194624.

The previous prime is 51814669. The next prime is 51814703. The reversal of 51814691 is 19641815.

It is a de Polignac number, because none of the positive numbers 2^k-51814691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51814621) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1916 + ... + 10358.

It is an arithmetic number, because the mean of its divisors is an integer number (4825746).

Almost surely, 2^51814691 is an apocalyptic number.

51814691 is a deficient number, since it is larger than the sum of its proper divisors (6094261).

51814691 is a wasteful number, since it uses less digits than its factorization.

51814691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8498 (or 8479 counting only the distinct ones).

The product of its digits is 8640, while the sum is 35.

The square root of 51814691 is about 7198.2422159858. The cubic root of 51814691 is about 372.8072110935.

The spelling of 51814691 in words is "fifty-one million, eight hundred fourteen thousand, six hundred ninety-one".