51505151 has 4 divisors (see below), whose sum is σ = 51687432. Its totient is φ = 51322872.

The previous prime is 51505127. The next prime is 51505159. The reversal of 51505151 is 15150515.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51505151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505159) 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, 90716 + ... + 91281.

It is an arithmetic number, because the mean of its divisors is an integer number (12921858).

Almost surely, 2^51505151 is an apocalyptic number.

51505151 is a deficient number, since it is larger than the sum of its proper divisors (182281).

51505151 is a wasteful number, since it uses less digits than its factorization.

51505151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182280.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 51505151 is about 7176.7089254059. The cubic root of 51505151 is about 372.0633467295.

Adding to 51505151 its reverse (15150515), we get a palindrome (66655666).

It can be divided in two parts, 5150 and 5151, that added together give a palindrome (10301).

The spelling of 51505151 in words is "fifty-one million, five hundred five thousand, one hundred fifty-one".