51689494 has 8 divisors (see below), whose sum is σ = 77829840. Its totient is φ = 25746216.

The previous prime is 51689471. The next prime is 51689497. The reversal of 51689494 is 49498615.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689497) 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 3 ways as a sum of consecutive naturals, for example, 48609 + ... + 49660.

It is an arithmetic number, because the mean of its divisors is an integer number (9728730).

Almost surely, 2^51689494 is an apocalyptic number.

51689494 is a deficient number, since it is larger than the sum of its proper divisors (26140346).

51689494 is a wasteful number, since it uses less digits than its factorization.

51689494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98534.

The product of its digits is 311040, while the sum is 46.

The square root of 51689494 is about 7189.5405972844. The cubic root of 51689494 is about 372.5067043821.

The spelling of 51689494 in words is "fifty-one million, six hundred eighty-nine thousand, four hundred ninety-four".