51697844 has 12 divisors (see below), whose sum is σ = 98695968. Its totient is φ = 23499000.

The previous prime is 51697831. The next prime is 51697847. The reversal of 51697844 is 44879615.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1174951 = 51697844 / (5 + 1 + 6 + 9 + 7 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 51697795 and 51697804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51697847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587432 + ... + 587519.

It is an arithmetic number, because the mean of its divisors is an integer number (8224664).

Almost surely, 2^51697844 is an apocalyptic number.

It is an amenable number.

51697844 is a deficient number, since it is larger than the sum of its proper divisors (46998124).

51697844 is a wasteful number, since it uses less digits than its factorization.

51697844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174966 (or 1174964 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 51697844 is about 7190.1212785321. The cubic root of 51697844 is about 372.5267617366.

The spelling of 51697844 in words is "fifty-one million, six hundred ninety-seven thousand, eight hundred forty-four".