51696849 has 4 divisors (see below), whose sum is σ = 68929136. Its totient is φ = 34464564.

The previous prime is 51696839. The next prime is 51696857. The reversal of 51696849 is 94869615.

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 51696849 - 2¹³ = 51688657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51696798 and 51696807.

It is not an unprimeable number, because it can be changed into a prime (51696839) 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, 8616139 + ... + 8616144.

It is an arithmetic number, because the mean of its divisors is an integer number (17232284).

Almost surely, 2^51696849 is an apocalyptic number.

It is an amenable number.

51696849 is a deficient number, since it is larger than the sum of its proper divisors (17232287).

51696849 is a wasteful number, since it uses less digits than its factorization.

51696849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17232286.

The product of its digits is 466560, while the sum is 48.

The square root of 51696849 is about 7190.0520860422. The cubic root of 51696849 is about 372.5243717820.

The spelling of 51696849 in words is "fifty-one million, six hundred ninety-six thousand, eight hundred forty-nine".