51739849 has 4 divisors (see below), whose sum is σ = 59131264. Its totient is φ = 44348436.

The previous prime is 51739847. The next prime is 51739859. The reversal of 51739849 is 94893715.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 51739849 - 2¹ = 51739847 is a prime.

It is a super-3 number, since 3×51739849³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51739799 and 51739808.

It is not an unprimeable number, because it can be changed into a prime (51739841) 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, 3695697 + ... + 3695710.

It is an arithmetic number, because the mean of its divisors is an integer number (14782816).

Almost surely, 2^51739849 is an apocalyptic number.

It is an amenable number.

51739849 is a deficient number, since it is larger than the sum of its proper divisors (7391415).

51739849 is an equidigital number, since it uses as much as digits as its factorization.

51739849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7391414.

The product of its digits is 272160, while the sum is 46.

The square root of 51739849 is about 7193.0417070944. The cubic root of 51739849 is about 372.6276282930.

The spelling of 51739849 in words is "fifty-one million, seven hundred thirty-nine thousand, eight hundred forty-nine".