51016551 has 4 divisors (see below), whose sum is σ = 68022072. Its totient is φ = 34011032.

The previous prime is 51016543. The next prime is 51016571. The reversal of 51016551 is 15561015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51016551 - 2³ = 51016543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51016571) 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, 8502756 + ... + 8502761.

It is an arithmetic number, because the mean of its divisors is an integer number (17005518).

Almost surely, 2^51016551 is an apocalyptic number.

51016551 is a deficient number, since it is larger than the sum of its proper divisors (17005521).

51016551 is a wasteful number, since it uses less digits than its factorization.

51016551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17005520.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51016551 is about 7142.5871363253. The cubic root of 51016551 is about 370.8830890721.

Adding to 51016551 its reverse (15561015), we get a palindrome (66577566).

The spelling of 51016551 in words is "fifty-one million, sixteen thousand, five hundred fifty-one".