51651071 has 4 divisors (see below), whose sum is σ = 51666000. Its totient is φ = 51636144.

The previous prime is 51651023. The next prime is 51651109. The reversal of 51651071 is 17015615.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51651071 - 2¹⁸ = 51388927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51651071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651011) 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, 710 + ... + 10188.

It is an arithmetic number, because the mean of its divisors is an integer number (12916500).

Almost surely, 2^51651071 is an apocalyptic number.

51651071 is a deficient number, since it is larger than the sum of its proper divisors (14929).

51651071 is an equidigital number, since it uses as much as digits as its factorization.

51651071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14928.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 51651071 is about 7186.8679548187. The cubic root of 51651071 is about 372.4143814753.

Adding to 51651071 its reverse (17015615), we get a palindrome (68666686).

The spelling of 51651071 in words is "fifty-one million, six hundred fifty-one thousand, seventy-one".