51411581 has 8 divisors (see below), whose sum is σ = 56717304. Its totient is φ = 46298880.

The previous prime is 51411559. The next prime is 51411583. The reversal of 51411581 is 18511415.

It can be written as a sum of positive squares in 4 ways, for example, as 60025 + 51351556 = 245^2 + 7166^2 .

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 51411581 - 2⁶ = 51411517 is a prime.

It is a super-2 number, since 2×51411581² = 5286301321839122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51411581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51411583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47696 + ... + 48761.

It is an arithmetic number, because the mean of its divisors is an integer number (7089663).

Almost surely, 2^51411581 is an apocalyptic number.

It is an amenable number.

51411581 is a deficient number, since it is larger than the sum of its proper divisors (5305723).

51411581 is a wasteful number, since it uses less digits than its factorization.

51411581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96511.

The product of its digits is 800, while the sum is 26.

The square root of 51411581 is about 7170.1869571163. The cubic root of 51411581 is about 371.8378995636.

Adding to 51411581 its reverse (18511415), we get a palindrome (69922996).

The spelling of 51411581 in words is "fifty-one million, four hundred eleven thousand, five hundred eighty-one".