51416521 has 4 divisors (see below), whose sum is σ = 55371652. Its totient is φ = 47461392.

The previous prime is 51416513. The next prime is 51416531. The reversal of 51416521 is 12561415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12561415 = 5 ⋅2512283.

It can be written as a sum of positive squares in 2 ways, for example, as 4562496 + 46854025 = 2136^2 + 6845^2 .

It is a cyclic number.

It is not a de Polignac number, because 51416521 - 2³ = 51416513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51416531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1977546 + ... + 1977571.

It is an arithmetic number, because the mean of its divisors is an integer number (13842913).

Almost surely, 2^51416521 is an apocalyptic number.

It is an amenable number.

51416521 is a deficient number, since it is larger than the sum of its proper divisors (3955131).

51416521 is a wasteful number, since it uses less digits than its factorization.

51416521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955130.

The product of its digits is 1200, while the sum is 25.

The square root of 51416521 is about 7170.5314307937. The cubic root of 51416521 is about 371.8498088154.

Adding to 51416521 its reverse (12561415), we get a palindrome (63977936).

The spelling of 51416521 in words is "fifty-one million, four hundred sixteen thousand, five hundred twenty-one".