51989694 has 8 divisors (see below), whose sum is σ = 103979400. Its totient is φ = 17329896.

The previous prime is 51989687. The next prime is 51989701. The reversal of 51989694 is 49698915.

It is an interprime number because it is at equal distance from previous prime (51989687) and next prime (51989701).

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

51989694 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4332469 + ... + 4332480.

It is an arithmetic number, because the mean of its divisors is an integer number (12997425).

Almost surely, 2^51989694 is an apocalyptic number.

51989694 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51989694 is a wasteful number, since it uses less digits than its factorization.

51989694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8664954.

The product of its digits is 699840, while the sum is 51.

The square root of 51989694 is about 7210.3879229900. The cubic root of 51989694 is about 373.2264555525.

The spelling of 51989694 in words is "fifty-one million, nine hundred eighty-nine thousand, six hundred ninety-four".