51641581 has 8 divisors (see below), whose sum is σ = 53010144. Its totient is φ = 50280720.

The previous prime is 51641549. The next prime is 51641621. The reversal of 51641581 is 18514615.

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 51641581 - 2⁵ = 51641549 is a prime.

It is a super-2 number, since 2×51641581² = 5333705776359122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51641531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13191 + ... + 16651.

It is an arithmetic number, because the mean of its divisors is an integer number (6626268).

Almost surely, 2^51641581 is an apocalyptic number.

It is an amenable number.

51641581 is a deficient number, since it is larger than the sum of its proper divisors (1368563).

51641581 is a wasteful number, since it uses less digits than its factorization.

51641581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3851.

The product of its digits is 4800, while the sum is 31.

The square root of 51641581 is about 7186.2076925177. The cubic root of 51641581 is about 372.3915718228.

The spelling of 51641581 in words is "fifty-one million, six hundred forty-one thousand, five hundred eighty-one".