51140641 has 4 divisors (see below), whose sum is σ = 54148932. Its totient is φ = 48132352.

The previous prime is 51140611. The next prime is 51140689. The reversal of 51140641 is 14604115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27081616 + 24059025 = 5204^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 51140641 - 2⁹ = 51140129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51140611) 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, 1504120 + ... + 1504153.

It is an arithmetic number, because the mean of its divisors is an integer number (13537233).

Almost surely, 2^51140641 is an apocalyptic number.

It is an amenable number.

51140641 is a deficient number, since it is larger than the sum of its proper divisors (3008291).

51140641 is a wasteful number, since it uses less digits than its factorization.

51140641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008290.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 51140641 is about 7151.2684888766. The cubic root of 51140641 is about 371.1835511601.

Adding to 51140641 its reverse (14604115), we get a palindrome (65744756).

The spelling of 51140641 in words is "fifty-one million, one hundred forty thousand, six hundred forty-one".