51697849 has 4 divisors (see below), whose sum is σ = 59083264. Its totient is φ = 44312436.

The previous prime is 51697847. The next prime is 51697861. The reversal of 51697849 is 94879615.

51697849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51697849 - 2¹ = 51697847 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3692697 + ... + 3692710.

It is an arithmetic number, because the mean of its divisors is an integer number (14770816).

Almost surely, 2^51697849 is an apocalyptic number.

It is an amenable number.

51697849 is a deficient number, since it is larger than the sum of its proper divisors (7385415).

51697849 is an equidigital number, since it uses as much as digits as its factorization.

51697849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7385414.

The product of its digits is 544320, while the sum is 49.

The square root of 51697849 is about 7190.1216262314. The cubic root of 51697849 is about 372.5267737463.

The spelling of 51697849 in words is "fifty-one million, six hundred ninety-seven thousand, eight hundred forty-nine".