51694851 has 8 divisors (see below), whose sum is σ = 74228560. Its totient is φ = 31812192.

The previous prime is 51694847. The next prime is 51694859. The reversal of 51694851 is 15849615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51694851 - 2² = 51694847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1325509 = 51694851 / (5 + 1 + 6 + 9 + 4 + 8 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51694859) 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 7 ways as a sum of consecutive naturals, for example, 662716 + ... + 662793.

It is an arithmetic number, because the mean of its divisors is an integer number (9278570).

Almost surely, 2^51694851 is an apocalyptic number.

51694851 is a deficient number, since it is larger than the sum of its proper divisors (22533709).

51694851 is a wasteful number, since it uses less digits than its factorization.

51694851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325525.

The product of its digits is 43200, while the sum is 39.

The square root of 51694851 is about 7189.9131427299. The cubic root of 51694851 is about 372.5195725643.

The spelling of 51694851 in words is "fifty-one million, six hundred ninety-four thousand, eight hundred fifty-one".