51699449 has 4 divisors (see below), whose sum is σ = 51714036. Its totient is φ = 51684864.

The previous prime is 51699443. The next prime is 51699457. The reversal of 51699449 is 94499615.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 49000000 + 2699449 = 7000^2 + 1643^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51699449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51699443) 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, 1817 + ... + 10329.

It is an arithmetic number, because the mean of its divisors is an integer number (12928509).

Almost surely, 2^51699449 is an apocalyptic number.

It is an amenable number.

51699449 is a deficient number, since it is larger than the sum of its proper divisors (14587).

51699449 is an equidigital number, since it uses as much as digits as its factorization.

51699449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14586.

The product of its digits is 349920, while the sum is 47.

The square root of 51699449 is about 7190.2328891351. The cubic root of 51699449 is about 372.5306168249.

The spelling of 51699449 in words is "fifty-one million, six hundred ninety-nine thousand, four hundred forty-nine".