51261641 has 8 divisors (see below), whose sum is σ = 54022464. Its totient is φ = 48545200.

The previous prime is 51261629. The next prime is 51261643. The reversal of 51261641 is 14616215.

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

It is a cyclic number.

It is not a de Polignac number, because 51261641 - 2⁶ = 51261577 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 51261641.

It is not an unprimeable number, because it can be changed into a prime (51261643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8711 + ... + 13356.

It is an arithmetic number, because the mean of its divisors is an integer number (6752808).

Almost surely, 2^51261641 is an apocalyptic number.

It is an amenable number.

51261641 is a deficient number, since it is larger than the sum of its proper divisors (2760823).

51261641 is a wasteful number, since it uses less digits than its factorization.

51261641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22191.

The product of its digits is 1440, while the sum is 26.

The square root of 51261641 is about 7159.7235281818. The cubic root of 51261641 is about 371.4760636863.

Adding to 51261641 its reverse (14616215), we get a palindrome (65877856).

The spelling of 51261641 in words is "fifty-one million, two hundred sixty-one thousand, six hundred forty-one".