51009971 has 4 divisors (see below), whose sum is σ = 51028152. Its totient is φ = 50991792.

The previous prime is 51009967. The next prime is 51010019. The reversal of 51009971 is 17990015.

51009971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51009971 - 2² = 51009967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51009941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3890 + ... + 10823.

It is an arithmetic number, because the mean of its divisors is an integer number (12757038).

Almost surely, 2^51009971 is an apocalyptic number.

51009971 is a deficient number, since it is larger than the sum of its proper divisors (18181).

51009971 is a wasteful number, since it uses less digits than its factorization.

51009971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18180.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 51009971 is about 7142.1265040603. The cubic root of 51009971 is about 370.8671431643.

Adding to 51009971 its reverse (17990015), we get a palindrome (68999986).

The spelling of 51009971 in words is "fifty-one million, nine thousand, nine hundred seventy-one".