51505161 has 8 divisors (see below), whose sum is σ = 68929920. Its totient is φ = 34208592.

The previous prime is 51505159. The next prime is 51505163. The reversal of 51505161 is 16150515.

It is an interprime number because it is at equal distance from previous prime (51505159) and next prime (51505163).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51505161 - 2¹ = 51505159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51505163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31105 + ... + 32718.

It is an arithmetic number, because the mean of its divisors is an integer number (8616240).

Almost surely, 2^51505161 is an apocalyptic number.

It is an amenable number.

51505161 is a deficient number, since it is larger than the sum of its proper divisors (17424759).

51505161 is a wasteful number, since it uses less digits than its factorization.

51505161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64095.

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

The square root of 51505161 is about 7176.7096221040. The cubic root of 51505161 is about 372.0633708089.

Adding to 51505161 its reverse (16150515), we get a palindrome (67655676).

The spelling of 51505161 in words is "fifty-one million, five hundred five thousand, one hundred sixty-one".