51505651 has 4 divisors (see below), whose sum is σ = 51528352. Its totient is φ = 51482952.

The previous prime is 51505621. The next prime is 51505669. The reversal of 51505651 is 15650515.

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 51505651 - 2¹¹ = 51503603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51505621) 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, 7515 + ... + 12628.

It is an arithmetic number, because the mean of its divisors is an integer number (12882088).

Almost surely, 2^51505651 is an apocalyptic number.

51505651 is a deficient number, since it is larger than the sum of its proper divisors (22701).

51505651 is a wasteful number, since it uses less digits than its factorization.

51505651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22700.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51505651 is about 7176.7437602300. The cubic root of 51505651 is about 372.0645506937.

It can be divided in two parts, 5150 and 5651, that added together give a palindrome (10801).

The spelling of 51505651 in words is "fifty-one million, five hundred five thousand, six hundred fifty-one".