51640041 has 4 divisors (see below), whose sum is σ = 68853392. Its totient is φ = 34426692.

The previous prime is 51640031. The next prime is 51640051. The reversal of 51640041 is 14004615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51640031) and next prime (51640051).

It is not a de Polignac number, because 51640041 - 2¹⁸ = 51377897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51640031) 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, 8606671 + ... + 8606676.

It is an arithmetic number, because the mean of its divisors is an integer number (17213348).

Almost surely, 2^51640041 is an apocalyptic number.

It is an amenable number.

51640041 is a deficient number, since it is larger than the sum of its proper divisors (17213351).

51640041 is a wasteful number, since it uses less digits than its factorization.

51640041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17213350.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51640041 is about 7186.1005420186. The cubic root of 51640041 is about 372.3878700982.

Adding to 51640041 its reverse (14004615), we get a palindrome (65644656).

The spelling of 51640041 in words is "fifty-one million, six hundred forty thousand, forty-one".